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Sudoku Variants and other puzzlesSmall Sudoku Variants

Shidoku

Fill in the grid so that every row, every column, and every 2 x 2 box contains the digits 1 through 4. There is only one solution. You can find it by logic.

Rokudoku

Fill in the grid so that every row, every column, and every 3x2 box contains the digits 1 through 6. There is only one solution. You can find it by logic.

Logi-5 (Pento-Sudoku) Logi-5 (Pento-Sudoku) Magic Pentaminoes Jigsaw Rokudoku

Fill in the grid so that every row, every column, and every coloured region contains the digits 1 through 6. There is only one solution. You can find it by logic.

Mini Jigsaw Sudoku (7x7) Mini Sudoku (8x8)

Fill in the grid so that every row, every column, and 4x2 box contains the digits 1 through 8. There is only one solution. You can find it by logic.

Mini Jigsaw Sudoku (8x8)

Fill in the grid so that every row, every column, and 4x2 box contains the digits 1 through 8. There is only one solution. You can find it by logic.

Vanilla Sudoku Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. There is only one solution. You can find it by logic.

Big Sudoku Variants Maxi Sudoku (10x10) Maxi Sudoku (10x10) Maxi Sudoku (12x12)

Fill in the grid so that every row, every column, and 4x3 box contains the numbers 1 through 12. There is only one solution. You can find it by logic.

Maxi-Sudoku (15x15)

Jigsaw Sudoku Irregular Sudoku (Jigsaw Sudoku, Geometric Sudoku)

Fill in the grid so that every row, every column, and every outlined region contains the digits 1 through 9. There is only one solution. You can find it by logic.

Cylindrical Sudoku

Fill in the grid so that every row, every column, and every marked region contains the digits 1 through 9. The grid is joined at the outermost columns as if it were a cylindrical grid. There is only one solution. You can find it by logic.

Cylindrical Stairstep Sudoku

Fill in the grid so that every row, every column, and every marked region contains the digits 1 through 9. The grid is joined at the outermost columns as if it were a cylindrical grid. There is only one solution. You can find it by logic.

Toroidal Sudoku

Fill in the grid so that every row, every column, and every marked region contains the digits 1 through 9. The grid is joined at the outermost columns and rows as if it were a toroidal grid. There is only one solution. You can find it by logic.

Offset Sudoku

Fill in the grid so that every of the nine marked 3x3 box contains the digits 1 through 9. No digit can repeat in a row or column. There is only one solution. You can find it by logic.

ABCD Knot ABCD Knot

Fill the letters from A through D into the grid. All letters must be in each cage and equal letters can't be orthogonally adjazent. There is only one solution. You can find it by logic.

Example:

Sudoku and latin squares with known extra regions Windoku (Four-Box Sudoku, Hyper Sudoku)

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The colored extra-regions must contain each the digits 1 through 9. There is only one solution. You can find it by logic.

Creasing Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Numbers going along grey lines must be in increasing or decreasing order from one end to the other. There is only one solution. You can find it by logic.

Centerdot Sudoku

Fill in the grid so that every row, every column, every 3x3 box and the cyan cells contain the digits 1 through 9. There is only one solution. You can find it by logic.

Centerdot Sudoku X

Fill in the grid so that every row, every column, every 3x3 box, the cyan cells and both diagonals contain the digits 1 through 9. There is only one solution. You can find it by logic.

Asterisk Square

Fill in the grid so that every row, every column and the cyan cells contain the digits 1 through 9. (There aren't any 3x3 boxes.) There is only one solution. You can find it by logic.

Asterisk Square X

Fill in the grid so that every row, every column, the cyan cells and both diagonals contain the digits 1 through 9. (There aren't any 3x3 boxes.) There is only one solution. You can find it by logic.

Asterisk Sudoku

Fill in the grid so that every row, every column, the 3x3 boxes and the colored cells contain the digits 1 through 9. There is only one solution. You can find it by logic.

Asterisk Sudoku X

Fill in the grid so that every row, every column, the 3x3 boxes, both diagonals and the colored cells contain the digits 1 through 9. There is only one solution. You can find it by logic.

Girandola Sudoku

Fill in the grid so that every row, every column, every 3x3 box and the cyan cells contain the digits 1 through 9. There is only one solution. You can find it by logic.

Sight Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains besides the men digits 1 through 8. The men must see all 8 digits once if he looks orthogonally. His sight is blocked by walls. There is only one solution. You can find it by logic.

Disjoint Groups Sudoku

Fill in the grid so that every row, every column, and every marked region, and cells with the same color contain the digits 1 through 9. There is only one solution. You can find it by logic.

Colour Sudoku (Plum Sudoku)

Fill in the grid so that every row, every column, and cells with the same color contain the digits 1 through 9. (There aren't any boxes.) There is only one solution. You can find it by logic.

Colour Sudoku Extra-Regions Sudoku: 2 pyramids

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The colored pyramids must contain each the digits 1 through 9. There is only one solution. You can find it by logic.

Extra-Regions Sudoku: 2 squares

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The colored squares must contain each the digits 1 through 9. There is only one solution. You can find it by logic.

Extra-Regions Sudoku: 4 pyramids

Fill in the grid so that every row, every column, every 3x3 box and every colored pyramid contains the digits 1 through 9. There is only one solution. You can find it by logic.

Extra-Regions Sudoku: 2 overlapping squares

Fill in the grid so that every row, every column, every 3x3 box and every colored square contains the digits 1 through 9. There is only one solution. You can find it by logic.

Latin Square with 6 overlapping squares

Fill in the grid so that every row, every column and every colored square contains the digits 1 through 9. There is only one solution. You can find it by logic.

Quadruple Clue Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Each set of 4 small digits stands for the number in the four adjacent cells to this set. There is only one solution. You can find it by logic.

Old Sudoku Variant

The first sudokus published in Dell Pencil Puzzles & Word Games (1979) were exemples of this sudoku variant. Here a puzzle created by me.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Each of the numbers in circles below goes into one of the circle boxes in the diagram (not necessarily in the order given). There is only one solution. You can find it by logic.

Touchless Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Equal digits can be neither orthogonally nor diagonally adjazent. There is only one solution. You can find it by logic.

Snake Sudoku

Fill in the grid so that every row, every column, every 3x3 box and both cyan groups contain the digits 1 through 9. There is only one solution. You can find it by logic.

Old Lace Sudoku

Fill in the grid so that every row, every column, every 3x3 box and the cyan cells contain the digits 1 through 9. There is only one solution. You can find it by logic.

Black Jack Sudoku

Fill in the grid so that every row, every column, every 3x3 box and the three colored regions contain the digits 1 through 9. There is only one solution. You can find it by logic.

Jing Sudoku

Fill in the grid so that every row, every column and the 3x3 boxes contain the digits 1 through 9. The green cell must be different from all yellow cells. There is only one solution. You can find it by logic.

Fillomino Variants Fillomino

Divide the grid into areas and write a number in every field. The numbers in the same area have to be the same and have to tell the number of fields in that area. Areas of same size my not touch horizontally or vertically, but diagonally. Given numbers may belong to the same area, and it's possible that there are areas, where no number is given, even with larger numbers as the once shown.

Example:

There is only one solution. You can find it by logic.

Bossomino

Divide the grid into areas and write a number in every field. The numbers in the same area have to be the same and have to tell the number of fields in that area. Areas of same size my not touch horizontally or vertically, but diagonally. Given numbers may belong to the same area, and it's possible that there are areas, where no number is given, even with larger numbers as the once shown.

In golden cells the number is the sum of the gaps of this cell with its orthogonal adjazent neighbors. In white cells the number can not be the sum of the gaps of this cell with its orthogonal adjazent neighbors.

Example:

There is only one solution. You can find it by logic.

Even Odd Fillomino

Divide the grid into areas and write a number in every field. The numbers in the same area have to be the same and have to tell the number of fields in that area. Areas of same size my not touch horizontally or vertically, but diagonally. Given numbers may belong to the same area, and it's possible that there are areas, where no number is given, even with larger numbers as the once shown. In green cells there are only even numbers, in yellow cells there are only odd numbers.

Example:

There is only one solution. You can find it by logic.

Fillomino Skyscraper

Divide the grid into areas and write a number in every field. The numbers in the same area have to be the same and have to tell the number of fields in that area. Areas of same size my not touch horizontally or vertically, but diagonally. Given numbers may belong to the same area, and it's possible that there are areas, where no number is given, even with larger numbers as the once shown. The clues along the edges tell you how many skyscrapers you can see from that vantage point.

Example:

There is only one solution. You can find it by logic.

Rectangular Dissection Puzzles Rekuto

Divide the grid into rectangular and square pieces such that each piece contains exactly one number, that each cell is part of one piece and that number represents the sum of the width and height of the rectangle.

Example:

There is only one solution. You can find it by logic.

Shikaku

Divide the grid into rectangular and square pieces such that each piece contains exactly one number, that each cell is part of one piece and that number represents the number of cells of the rectangle.

Example:

There is only one solution. You can find it by logic.

Daisho

Divide the grid into rectangular and square pieces. The greater less signs show which area cell is part of the rectangle with the greater number of cells.

Example:

There is only one solution. You can find it by logic.

Gardens

The diagram contains small gardens. This are rectangular green areas separated by hedges. Every garden consist of the number of squares that the given numbers show. Every garden contains exactly one number. The small gardens may only touch each other at the vertexes. Each 2x2 square must have at least one garden square.

Example:

There is only one solution. You can find it by logic.

Domino Dissection Puzzles Domino Search

The shown domino pieces have been arranged to form a rectangle. After that the borderlines between the pieces have been removed. Reconstruct the missing lines so that every domino piece exists exactly once in the diagram.

Example:

There is only one solution. You can find it by logic.

Angel Domino

Angel musicians are an integral part of Erzgebirgian Christmas traditions. In many homes there is a cloud with such wooden angels. Here is a puzzle with domino stones on which Christmas angels can be seen.

The domino pieces shown at the bottom have been arranged to form a rectangle. After that the borderlines between the pieces have been removed. Reconstruct the missing lines so that every domino piece exists exactly once in the diagram.

Tetris Dissection Puzzles Address Number

Divide the grid into areas of 4 cells and fill the cells with the numbers 1 through 4 such that each if you read from the top to the bottom and from the left to the right in each area is each number and these numbers have the order 1 - 2 - 3 - 4.

Example:

There is only one solution. You can find it by logic.

Anfitto

Divide the grid into areas of 4 cells such that each piece contains exactly one small blue piece with a form that is not placeable in this piece (if magnified).

Example:

There is only one solution. You can find it by logic.

Colorful Borders

Divide the grid into areas of 4 cells and color them with the colors red, blue and yellow. Areas of the same color may only touch each other at the vertexes. The color on the borders is the color that comes if we mix the colors of the neighbouring cells. Here red and blue becomes purple, red and yellow becomes orange and yellow and blue becomes green.

Example:

There is only one solution. You can find it by logic.

Topological Puzzle Bent between

Draw a closed loop into the diagram, that goes through every field exactly once. The line passes from every center of a field to the center of the next field. In a field with a circle the line has to bent 90°. Additionally, when following the line, between two circles, the line bents exactly once 90°.

Example:

There is only one solution. You can find it by logic.

Sudoku with unknown extra regions Square Sudoku

Fill in the grid so that every row and every column contains the digits 1 through 9. The points mark corners of squares. These squares have the size 2x2 or 3x3. No pair of squares can touch each other on corners or borders, but they can overlap similar to the picture with the blue squares. Number in squares must be different.

There is only one solution. You can find it by logic.

Sudoku X Worms

Connect in the left grid all dots in pairs in such a way that all cells are filled. Each path (worm) has to make a 90 degree turn in every cell it travels through and must contain at least one turn. After that fill in the right grid so that every row, every column, every 3x3 box and both diagonals contain the digits 1 through 9. If two cells are in the left grid in the same path (worm) then the corresponding cells in the right grid must be different.

There is only one solution. You can find it by logic.

Sudoku Snakes

Connect in the left grid all dots in pairs in such a way that all cells are filled. Each straight line must be at least 2 cells long. After that fill in the right grid so that every row, every column and every 3x3 box contain the digits 1 through 9. If two cells are in the left grid in the same path (snake) then the corresponding cells in the right grid must be different.

There is only one solution. You can find it by logic.

Sudoku X, Latin Squares with Diagonals Sudoku X

Fill in the grid so that every row, every column, 3x3 box and both diagonals contain the digits 1 through 9. There is only one solution. You can find it by logic.

Argyle Sudoku

Fill in the grid so that every row, every column, and 3x3 box contains the digits 1 through 9. In the marked diagonals all digits must be different. There is only one solution. You can find it by logic.

Rectangle Outline Sudoku

Fill in the grid so that every row, every column and 3x3 box contains the digits 1 through 9. Each marked diagonal must contain the digits 1 through the number of cells in this diagonal. (1 - 4, 1 - 6 or 1 - 9 respectively) There is only one solution. You can find it by logic.

Draconic Sudoku X

Fill in the grid so that every row, every column, every 3x3 box and both diagonals contains the digits 1 through 9. Moreover all pairs of diagonally adjazent cells must be different. There is only one solution. You can find it by logic.

Fish Bone Sudoku

Fill in the grid so that every row, every column, and 3x3 box contains the digits 1 through 9. In the marked diagonals all digits must be different. There is only one solution. You can find it by logic.

Snowflake Sudoku

Fill in the grid so that every row, every column, and 3x3 box contains the digits 1 through 9. In the marked diagonals all digits must be different. There is only one solution. You can find it by logic.

Sudoku Large X

Fill in the grids so that every row, every olumn, and 3x3 box contains the digits 1 through 9. In the marked diagonals all digits must be different. There is only one solution. You can find it by logic.

Sudoku Bold X

Fill in the grid so that every row, every column, and 3x3 box contains the digits 1 through 9. In the marked diagonals all digits must be different. There is only one solution. You can find it by logic.

Diamond Sudoku

Fill in the grid so that every row, every column, and 3x3 box contains the digits 1 through 9. In the marked diagonals all digits must be different. There is only one solution. You can find it by logic.

Going Down Sudoku

Fill in the grid so that every row, every column, and 3x3 box contains the digits 1 through 9. In the marked diagonals all digits must be different. There is only one solution. You can find it by logic.

Wrap Down Sudoku

Fill in the grid so that every row, every column, and 3x3 box contains the digits 1 through 9. In the marked diagonals all digits must be different. There is only one solution. You can find it by logic.

Going Up Sudoku

Fill in the grid so that every row, every column, and 3x3 box contains the digits 1 through 9. In the marked diagonals all digits must be different. There is only one solution. You can find it by logic.

Wrap Up Sudoku

Wrap Up SudokuFill in the grid so that every row, every column, and 3x3 box contains the digits 1 through 9. In the marked diagonals all digits must be different. There is only one solution. You can find it by logic.

Isosudoku

IsosudokuFill in the grid so that every row, 9-cell-diagonal, and 3x3 box contains the digits 1 through 9. In the shorter diagonals all digits must be different. There is only one solution. You can find it by logic.

Squared Outline Sudoku

Squared Outline SudokuFill in the grid so that every row, every column, and 3x3 box contains the digits 1 through 9. In the marked diagonals all digits must be different. There is only one solution. You can find it by logic.

Sudoku 37

Sudoku 37Fill in the grid the digits 1 through 7 so that no row, column, and diagonal contains any digits more then once. Different colors help to spot the diagonals. There is only one solution. You can find it by logic.

Slash Sudoku

Fill in the grid so that every row, every column, 3x3 box and the marked diagonal contains the digits 1 through 9. There is only one solution. You can find it by logic.

Parallel Sudoku

Fill in the grid so that every row, every column, and 3x3 box contains the digits 1 through 9. In the marked diagonals all digits must be different.

There is only one solution. You can find it by logic.

Magic Square

Fill in the grid so that every row, every column and both diagonals contain the digits 1 through 8. There is only one solution. You can find it by logic.

Even/Odd Sudoku Even/Odd Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Yellow cells must contain odd digits, green cells must contain even digits. There is only one solution. You can find it by logic.

Odd Sudoku

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box will have exactly one of each digit. In yellow cells can only be odd digits. In white cells both odd and even digits are possible. There is only one solution. You can find it by logic.

Other sudoku with restricted cells Sudoku 147

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Red cells must contain digits 1, 2 or 3, blue cells must contain digits 4, 5 or 6, and yellow cells must contain digits 7, 8 or 9. There is only one solution. You can find it by logic.

Big/Small/Even/Odd Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Yellow cells must contain odd digits, green cells must contain even digits. Red cells must contain small digits (1 - 4) and blue cells big digits (5 - 9). There is only one solution. You can find it by logic.

Word Rokudoku

Fill in the grid so that every row, every column, and every 3 x 2 box contains the digits 1 through 6. Digits are written in word form (in german) and some letters are already given. There is only one solution. You can find it by logic.

Pips Rokudoku

Fill in the grid so that every row, every column, and every 3 x 2 box contains the digits 1 through 6. Some pips are already given. There is only one solution. You can find it by logic.

Digital Rokudoku

Fill in the grid so that every row, every column, and every 2 x 3 box contains the digits 1 through 6. Each digit appears as in a liquid crystal display, as shown below. Parts of some digits are already placed in the grid. There is only one solution. You can find it by logic.

S for Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The letters in the cells are part of the english names of the digits in the cell. There is only one solution. You can find it by logic.

Outside Sudoku

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. Outside digits must be inserted in the corresponding row or column of the contiguos box. There is only one solution. You can find it by logic.

Demarcated Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 7. Digits in black cells must be inserted in the corresponding direction in one of the fields until the next black cell or the border. There is only one solution. You can find it by logic.

One digit to much

This is a simple sudoku variant. Delete in every cell one number, so that after that that every row, every column, and every 3x3 box contains the digits 1 through 9. There is only one solution. You can find it by logic.

Sukaku (Pencilmark Sudoku)

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. In the cells you find all allowed candidates for the specific cell. There is only one solution. You can find it by logic.

Pool Sudoku Bagua Sudoku

Fill in the grid so that every row, every column and the 3x3 boxes contain the digits 1 through 9. All eight green lines must use no more then four digits. Each line must use three of these digits. There is only one solution. You can find it by logic.

Bagua Zero Killer

Fill in the grid so that every row, every column and the 3x3 boxes contain the digits 1 through 9. The sum of the digits within each sub-region is equal to the specified number. No digits can be repeated in any cage. All eight green lines must use no more then four digits. Each line must use three of these digits. There is only one solution. You can find it by logic.

Mudan Sudoku

Fill in the grid so that every row, every column and the 3x3 boxes contain the digits 1 through 9. All eight green lines must use no more then four digits. Each line must use three of these

digits. All yellow cells must contain odd digits. There is only one solution. You can find it by logic.

Shi Sudoku

Fill in the grid so that every row, every column and the 3x3 boxes contain the digits 1 through 9. In the yellow cells there are 6 different values. There is only one solution. You can find it by logic.

King Sudoku

Fill in the grid so that every row, every column and the 3x3 boxes contain the digits 1 through 9. In the yellow cells there are 6 different values. There is only one solution. You can find it by logic.

Dan Sudoku

Fill in the grid so that every row, every column and the 3x3 boxes contain the digits 1 through 9. In the yellow cells there are 7 different values. There is only one solution. You can find it by logic.

Shen Sudoku

Fill in the grid so that every row, every column and the 3x3 boxes contain the digits 1 through 9. In the yellow cells there are 7 different values. There is only one solution. You can find it by logic.

Zhong Sudoku

Fill in the grid so that every row, every column and the 3x3 boxes contain the digits 1 through 9. In the yellow cells there are 7 different values. There is only one solution. You can find it by logic.

Greater/Less Sudoku, Futoshiki Greater/Less Sudoku

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. Numbers must be placed according to greater (>) and less (<) signs. There is only one solution. You can find it by logic.

Larger/Smaller Sudoku X

Fill in the grid so that every row, every column, every 3x3 box and both diagonals contain the digits 1 through 9. Blue cells indicate the digit is lower than all it's orthogonally adjacent cells. Red cells are higher than all it's orthogonally adjacent cells. White cells indicate the digit is both higher and lower than it's orthogonally adjacents.

There is only one solution. You can find it by logic.

Futoshiki (Hutosiki)

Fill in the grid so that every row and every column contains the digits 1 through 9. Numbers must be placed according to greater (>) and less (<) signs.

There is only one solution. You can find it by logic.

Max Quad Sudoku

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box will have exactly one of each digit. The red points in the near of crosses where four cells meet each other show that the cell with the red points is greater then the three other ones.

There is only one solution. You can find it by logic.

Min Max Quad Sudoku

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box will have exactly one of each digit. The red points in the near of crosses where four cells meet each other show that the cell with the red points is greater then the three other ones. The blue rings in the near of

crosses where four cells meet each other show that the cell with the blue ring is smaller then the three other ones.

There is only one solution. You can find it by logic.

Border Maximum Sudoku

Fill in the grid with the digits 1 to 9. Each row, column and 3x3-box will have exactly one of each digit. The clues along the egdes tell you in which cell you can find the maximum of the first three cells in the corresponding row or column.

There is only one solution. You can find it by logic.

Inequality/Difference Square

Fill in the grid so that every row and every column contains the digits 1 through 5. Numbers must be placed according to greater (>) and less (<) signs. The numbers between two cells give the difference of the digits. There is only one solution. You can find it by logic.

Inequality/Difference Sudoku

Fill in the grid so that every row, every column and every 3x3 box contains the digits 1 through 9. Numbers must be placed according to greater (>) and less (<) signs. The numbers between two cells give the difference of the digits.

There is only one solution. You can find it by logic.

Arrow Path Sudoku

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The arrows show where the successor of the digit in the cell is (within the box). The digit 9 has an arrow in direction to number 1.

There is only one solution. You can find it by logic.

Fortress Sudoku

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. If a green and a white cell are orthogonally adjazent then the green cell has the greater value.

Up and Down Up and Down

Fill in the white cells of the grid the digits 1 through 4 so that no row and no column contains any number twice. In each row and column the numbers are alternating larger and smaller.

Example:

There is only one solution. You can find it by logic.

Up and Down Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. In each green line the numbers are alternating larger and smaller.

Smaller Example:

There is only one solution. You can find it by logic.

Total Rising Total Rising

Fill the grid with the digits 1 through 9. Each digit occurs exactly two times. Adjazent cells have different digits. The groupings marked both above and below the cells gives an increasing series of numbers.

Smaller example with the digits 1 through 4:

There is only one solution. You can find it by logic.

Sudoku with equal cells

Equality Rokudoku

Fill in the grid so that every row, every column, and every 2 x 3 box contains the digits 1 through 6. The digits in the green cells as well as the digits in the green cells must be equal. There is only one solution. You can find it by logic.

Wallpaper Sudoku

Fill in the grid so that every row, every column, and every marked region contains the digits 1 through 9. All the numbers in 3x3 boxes of the same color are exactly the same in position. There is only one solution. You can find it by logic.

Figure Sudoku Figure Sudoku

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box has exactly one of each digit. All occurrences of each shape outlined in black (rotated and/or mirrored) must contain the same set of digits (possibly in different orders). None shape contains a repeated digit.

There is only one solution. You can find it by logic.

Diamond Figure Sudoku

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box has exactly one of each digit. The four edges of the green square must contain the same set of digits (possibly in different orders). None edge of this square contains a repeated digit.

There is only one solution. You can find it by logic.

Figure Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. All occurrences of each

shape outlined in black (rotated and/or mirrored) must contain the same set of digits (possibly in different orders). None shape contains a repeated digit. There is only one solution. You can find it by logic.

Zero Figure Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. In the blue areas there must always be the same set of digits (possibly in different orders). There is only one solution. You can find it by logic.

Wheel Sudoku Wheel Sudoku

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box has exactly one of each digit. The wheels in the grid contain each 4 values. These values will go in the cells the numbers are in. Doing this the wheels must be rotatated to the right position. (Not mirrored or changed the order of the digits.)

There is only one solution. You can find it by logic.

Wheel Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The wheels in the grid contain each 4 values. These values will go in the cells the numbers are in. Doing this the wheels must be rotatated to the right position. (Not mirrored or changed the order of the digits.)

There is only one solution. You can find it by logic.

Sum Sudoku (Killer) and Magic Squares with given Sums Sum Sudoku (Killer Sudoku)

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The sum of the digits within each sub-region is equal to the specified number. No digits can be repeated in any cage. There is only one solution. You can find it by logic.

Zero Killer Sudoku

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The sum of the digits within each sub-region is equal to the specified number. No digits can be repeated in any cage.

There is only one solution. You can find it by logic.

Zero Killer X Zero Killer X

Fill in the grid so that every row, every column, every 3 x 3 box and both diagonals contain the digits 1 through 9. The sum of the digits within each sub-region is equal to the specified number. No digits can be repeated in any cage.

There is only one solution. You can find it by logic.

Zero Killer with even and odd cells

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The sum of the digits within each sub-region is equal to the specified number. No digits can be repeated in any cage. The colours say you whether an individual cell is even (green cells) or odd (yellow cells). There is only one solution. You can find it by logic.

Frame Sudoku

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. Digits in the outside frame equal the sum of the three numbers of the corresponding row or column in the contigous box. There is only one solution. You can find it by logic.

Jigsaw Sum Sudoku (Jigsaw Killer Sudoku)

Fill in the grid so that every row, every column, and every outlined region contains the digits 1 through 9. The sum of the digits within each sub-region is equal to the specified number. No digits can be repeated in any cage. There is only one solution. You can find it by logic.

Intersection Killer

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The specified numbers are equal to the sum of there horizontally and vertically adjazent cells. (There is no extra constraint that they must be different.) There is only one solution. You can find it by logic.

Corner Squad Sudoku (Additional Help Sudoku)

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The given numbers are the sum of the digits in all adjazent cells. A clue-number ist either the sum of two or four numbers. There is only one solution. You can find it by logic.

Duplex Sums Sudoku (Additional Help Sudoku)

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The numbers are the sum of the digits in adjazent cells. There is only one solution. You can find it by logic.

7 Sum Square

Fill in the grid so that every row and every column contains the digits 1 through 6. The 7's are the sum of the digits in adjazent cells. There is only one solution. You can find it by logic.

10 Sum Sudoku

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box has exactly one of each digit. Taking 180-degree rotational symmetry, the sum of mirrored cells must be 10. There is only one solution. You can find it by logic.

Line Magic

Fill in the grid so that every row, every column and both diagonals contain the digits 1 through 9. Each blue line marks that the sum of the two neighbored cells is 11. There is only one solution. You can find it by logic.

Sudoku with End Sum

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Some rows and columns have numbers. They represent the sum of the two ends.

There is only one solution. You can find it by logic.

Sudoku Pairs

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The sum of the connected pairs is 10.

There is only one solution. You can find it by logic.

Odd X Zero Killer Skyscraper

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The numbers tell you the sum of the marked cages. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The cells on both diagonals have odd digits. In cages there can't be the same digit repeated. There is only one solution. You can find it by logic.

Bagua Zero Killer

Fill in the grid so that every row, every column and the 3x3 boxes contain the digits 1 through 9. The sum of the digits within each sub-region is equal to the specified number. No digits can be repeated in any cage. All eight green lines must use no more then four digits. Each line must use three of these digits.

There is only one solution. You can find it by logic.

Hexagonal Killer

Put the numbers 1 through 6 into the hexagonal cells so that every line (of any length) contains every digit not more than once. The numbers around the grid are the sum in the direction of the arrows. There is only one solution. You can find it by logic.

Smaller example with the numbers 1 through 4:

Sudoku with magic squares Sudoku with a magic square

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The blue area marks a magic square, i. e., the sums of any row, any column and both main diagonals in this area are always the same. There is only one solution. You can find it by logic.

Sudoku with a hidden magic square

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. There is a magic square in this sudoku, i.e. there is a area of 3x3 cells in this grid where the sums of any row, any column and both main diagonals in this area are always the same. There is only one solution. You can find it by logic.

Sudoku with 4 magic squares

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The colored areas mark magic squares, i. e., the sums of any row, any column and both main diagonals in these areas are always the same. There is only one solution. You can find it by logic.

Sudoku with 5 magic squares

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The 4 colored areas mark magic squares, i. e., the sums of any row, any column and both main diagonals in these areas are always the same.

If you have found it you can find an additional magic square. There is only one solution. You can find it by logic.

Sudoku with a magic square and 8 semi-magic squares

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The colored area marks a magic squares, i. e., the sums of any row, any column and both main diagonals in these area are always the same. In the other 3 x 3 boxes the sums of any row, and column are always the same, but the main diagonals could have another sum. There is only one solution. You can find it by logic.

Pandigital Sudoku Pandigital Sudoku

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. Additional the rows form 9 correct arithmetic expressions reading from left to right. There is only one solution. You can find it by logic.

Sum Box Sudoku

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. There are 6 boxes with a plus or minus sign where the sum or difference of the number formed by the first two rows is equal to the number formed in the third row of the same box. There is only one solution. You can find it by logic.

Pandigital Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. Additional the rows form 9 correct arithmetic expressions reading from left to right. There is only one solution. You can find it by logic.

Sum Box Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. There are 6 boxes with a plus or minus sign where the sum or difference of the number formed by the first two rows is equal to the number formed in the third row of the same box. There is only one solution. You can find it by logic.

Inequality Killer Inequality Killer

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The relation signs mark the relations between the sums of the digits of the sub-regions.

There is only one solution. You can find it by logic.

Equality Killer Sum Search Sudoku Sum Search Sudoku

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The sums of the digits within each sub-region are equal to each other. In sub-regions there can be the same digit repeated. There is only one solution. You can find it by logic.

Neighbouring Sudoku

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. For each cell with a circle sum of its vertical neighbours must be equal to the sum of its horizontal neighbours.

There is only one solution. You can find it by logic.

Sum Search Skyscraper Killer

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The sums of the digits within each sub-region are equal to each other. In sub-regions there can't be the same digit repeated.

There is only one solution. You can find it by logic.

Lettered Rokudoku

Fill in the grid so that every row, every column, and every 3 x 2 box contains the digits 1 through 6. Digits are written in word form (in german). The numbers of letters in dotted boxes must be equal to each other.

There is only one solution. You can find it by logic.

Last Number Sum Search Sudoku

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. A red arrow means that the digits are going up till they hit this number and for a cyan arrow they go down till they hit this particular number.

For example:

135247896 could get a red arrow with a 5 or a cyan arrow with a 1. 932415678 could get a red arrow with a 9 or a cyan arrow with a 2.

The sums of the digits within each sub-region are equal to each other. In sub-regions there can't be the same digit repeated. There is only one solution. You can find it by logic.

Dissection Killer Retro Killer

Fill cages in the grid so that each cell is part of exactly one cage. Additional fill digits in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. In every cage is exactly one number and this is the sum of the digits in this cage. All cages are rectangles or squares of at least two cells. In cages no number is repeated.

Example:

There is only one solution. You can find it by logic.

Daisho Killer

Divide the grid into rectangular and square pieces of at least 2 cells. Additional fill digits in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The arrows show which cell is part of the rectangle with the greater number of cells. In every piece is exactly one number and this is the sum of the digits in this piece. In pieces no number is repeated.

Example with the digits 1 through 6:

There is only one solution. You can find it by logic.

Even Odd Killer, Brick Sudoku KiMo 2

Fill the grid with the digits 1 through 9. Each row, column and 3x3-box has exactly one of each digit. The coloured points tell you whether the sum in the marked cage is odd (yellow point) or even (green point). In cages there can't be the same digit repeated. There is only one solution. You can find it by logic.

Even Odd Killer

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box will have exactly one of each digit. The numbers tell you the sum of the marked cages. The coloured points tell you whether the sums in the marked cages are odd (yellow point) or even (green point). In cages there can't be the same digit repeated. There is only one solution. You can find it by logic.

Even Odd Zero Killer X

Fill the grid with the digits 1 to 9. Each row, column, 3x3-box and both diagonals have exactly one of each digit. The numbers tell you the sum of the marked cages. The coloured points tell you whether the sums in the marked cages are odd (yellow point) or even (green point). In cages there can't be the same digit repeated. There is only one solution. You can find it by logic.

Even Odd Killer Skyscraper

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The coloured points tell you whether the sums in the marked cages are odd (yellow point) or even (green point). In cages there can't be the same digit repeated. There is only one solution. You can find it by logic.

Brick Sudoku

Fill in the grid so that every row, every column contains the digits 1 through 6. On the same brick never should be two odd or two even numbers. There is only one solution. You can find it by logic.

Other Killer with restricted sums KiMo

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box will have exactly one of each digit. The numbers tell you the last digit of the sums of the marked cages. In cages there can't be the same digit repeated. There is only one solution. You can find it by logic.

KiMo Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The digits in marked cages are the last digit of the sum of the digits in the cage. In cages there can't be the same digit repeated. There is only one solution. You can find it by logic.

KiMo 7 Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The digits in marked cages have always a sum that is a multiple of 7 (i. e. 7, 14, 21, 28, 35 or 42). In cages there can't be the same digit repeated.

There is only one solution. You can find it by logic.

Arrow Sudoku Arrow Rokudoku

Fill in the grid so that every row, every column, and every 2 x 3 box contains the digits 1 through 6. The digit in a circle is the sum of the digits which are marked with its arrow. There is only one solution. You can find it by logic.

Arrow Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The digit in a circle is the sum of the digits which are marked with its arrow. There is only one solution. You can find it by logic.

Equal Value Killer Equal Value Zero Killer

Fill in the grid so that every row, every column and the 3x3 boxes contain the digits 1 through 9. The sum of the digits within each sub-region is equal to the specified number. No digits can be repeated in any cage. All eight blue lines must use the same three digits. Each line must use three different digits. There is only one solution. You can find it by logic.

Sum Line Sudoku Sum Line Sudoku

Fill in the grid so that every row, every column and every 3x3 box contain the digits 1 through 9. On each line one cell is the sum of the others. There is only one solution. You can find it by logic.

Pseudo-Killer Pseudo-Killer

Fill in the grid so that every row/column contains all the numbers from 1 to the length of that particular row/column. The sum of the digits within each sub-region is equal to the specified number. No digits can be repeated in any cage. There is only one solution. You can find it by logic.

Other Sum Puzzle Tenner Grid

Fill in the grid so that every row contains the digits 0 through 9. In columns the numbers may be repeated. The bottom numbers give the sum of the column. Adjazent cells, even diagonally adjazent cells, must be different. There is only one solution. You can find it by logic.

Where is the biggest?

Fill in the grid with the digits 1 through 9. Each number should be used only once. The number in the coloured square is the sum of the four adjazent cells. The arrows show the biggest of the four adjazent digits. There is only one solution. You can find it by logic.

Addoku

Fill in the grid so that the grid contains the digits 1 through 9. Digits in the outside equal the sum of the three numbers of the corresponding row or column. There is only one solution. You can find it by logic.

Difference Sudoku with disallowed differences Consecutive Sudoku

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. All neighbouring cells with consecutive digits have a colored border between. There is only one solution. You can find it by logic.

Non-Consecutive Sudoku

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. There are no neighbouring cells with consecutive digits. There is only one solution. You can find it by logic.

Non-Consecutive Windoku

Fill the grid with the digits 1 to 8. Each row, column, 3x3-box and coloured region has exactly one of each digit. One cell is empty. There are no consecutive neighbouring cells. There is only one solution. You can find it by logic.

Non-Consecutive Sudoku X

Fill in the grid so that every row, every column, every 3 x 3 box and both diagonals contain the digits 1 through 9. There are no neighbouring cells with consecutive digits in rows or columns. There is only one solution. You can find it by logic.

Consecutive Even Odd Sudoku X

Fill the grid with the digits 1 to 9. Each row, column, 3x3-box and diagonal will have exactly one of each digit. In green cells can only be even digits. In yellow cells can only be odd digits. If two orthogonally or diagonally cells are conncted with a red line then the numbers in these cells are consecutive. There is only one solution. You can find it by logic.

Disallowed 3 Windoku

Fill the grid with the digits 1 to 9. Each row, column, 3x3-box and coloured region has exactly one of each digit. There are no neighbouring cells with a difference of 3. There is only one solution. You can find it by logic.

Disallowed 3 Skyscraper Windoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column, 3x3-box and cells of the same color have exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. There are no neighbouring cells with a difference of 3. There is only one solution. You can find it by logic.

Sudoku Ship

Fill in the grid the digits 1 through 9 so that in every row, every column (even if it is not continous) and in cells of the same color no digit is repeated. There are no neighbouring cells with consecutive digits. There is only one solution. You can find it by logic.

Dollar Sudoku Dollar Sudoku

Fill in the grid so that both lines (the column and the S-form) contain the digits 1 through 9. There are no neighbouring cells with consecutive digits. There is only one solution. You can find it by logic.

Tape Sudoku

Fill in the grid so that it contains the digits 1 through 6 three times each. There are no neighbouring cells with the same or with consecutive digits. There is only one solution. You can find it by logic.

Double Ring Sudoku

Fill in the grid so that so that both rings contain the digits 1 through 9. There are no neighbouring cells with the same or with consecutive digits. There is only one solution. You can find it by logic.

2 Lines

Fill in the grid so that both rows contain the digits 1 through 9. There are no neighbouring cells with equal or consecutive digits. There is only one solution. You can find it by logic.

Sudoku Chain

Fill in the grid so that every row, and every column contains the digits 1 through 7. All neighbouring cells with consecutive digits are connected by a line. If the digits are not consecutive there is no line. There is only one solution. You can find it by logic.

Sudoku Net

Fill in the grid with the digits 1 through 9 so that each digit appears two times. Numbers connected with a line are neither identical, nor consecutive.

There is only one solution. You can find it by logic.

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Fill in the grid with the digits 1 through 9 so that each digit appears three times. Numbers connected with a line are neither identical, nor consecutive.

There is only one solution. You can find it by logic.

Nonconsecutive Spider Sudoku

Fill in the grid so that every ring, spoke and 3x3 box contains the digits 1 through 9. There are no neighbouring cells with consecutive digits. There is only one solution. You can find it by logic. The sudoku has a rotational symmetry.

Nonconsecutive Circular Sudoku

Fill in the grid so that every ring and every pair of neighboured circle segments contains the digits 1 through 8. There are no neighbouring cells with consecutive digits. There is only one solution. You can find it by logic.

Other Difference Sudoku Difference Sudoku

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box has exactly one of each digit. The numbers between two cells give the difference of the digits. There is only one solution. You can find it by logic.

Sudoku with End Difference

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Some rows and columns have numbers. They represent the difference of the two ends. There is only one solution. You can find it by logic.

Inequality/Difference Square

Fill in the grid so that every row and every column contains the digits 1 through 5. Numbers must be placed according to greater (>) and less (<) signs. The numbers between two cells give the difference of the digits.

There is only one solution. You can find it by logic.

Inequality/Difference Sudoku

Fill in the grid so that every row, every column and every 3x3 box contains the digits 1 through 9. Numbers must be placed according to greater (>) and less (<) signs. The numbers between two cells give the difference of the digits. There is only one solution. You can find it by logic.

Pencil Sudoku

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box has exactly one of each digit. The top of the pencil is one digit higher as the other digit of the pencil. There is only one solution. You can find it by logic.

Other Difference Puzzles The Nonconsecutive Egg

Fill in the grid the digits 0 through 9. There are no cells with a common line and consecutive digits. (0 is consecutive with 1, not with 9.) There is only one solution. You can find it by logic.

Product Sudoku Product Sudoku

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The product of the digits within each sub-region is equal to the specified number. There is only one solution. You can find it by logic.

Frame Product Sudoku

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. Digits in the outside frame equal the product of the three numbers of the corresponding row or column in the contigious box. There is only one solution. You can find it by logic.

Sudoku with End Product

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Some rows and columns have numbers. They represent the product of the two ends. There is only one solution. You can find it by logic.

Intersection Product Sudoku

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The specified numbers are equal to the product of there horizontally and vertically adjazent cells. (There is no extra constraint that they must be different.)There is only one solution. You can find it by logic.

Duplex Plex Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Each clue-number is the product of the two neighbored digits.

There is only one solution. You can find it by logic.

Ratio Sudoku

Ratio Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The numbers between two cells give the ratio of the digits. For example 3/4 can stand for the following combinations of numbers in the adjazent cells: 3 - 4, 6 - 8, 4 - 3 and 8 - 6. There is only one solution. You can find it by logic.

Sudoku with End Ratio

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Some rows and columns have fractions. They represent the ratio of the two ends. For example 3/4 can stand for the following combinations of numbers in the two end cells: 3 - 4, 6 - 8, 4 - 3 and 8 - 6. There is only one solution. You can find it by logic.

1/2 Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Some rows and columns have fractions. The ratio of the connected pairs is 1/2, i. e. there are the following combinations of numbers in the two connected cells: 1 - 2, 2 - 4, 3 - 6 and 4 - 8 or vice versa. There is only one solution. You can find it by logic.

Doubles and Triples

Fill in the grid so that every row, every column, and every marked region contains the digits 1 through 6. If the ratio of two adjazent cells is 1:2 then you get 2 points (in the example marked with blue circles). If the ratio of two adjazent cells is 1:3 then you get 3 points (in the example marked with red circles). So in the example you would get 12 * 2 + 6 * 3 = 42 points.

Example:

Attempt to maximize your points. My record is 84 points.

Puzzle:

Sudoku with different algebraic operations Algebraic Sudoku X

Fill in the grid so that every row, every column, every 3x3 box and both diagonals contains the digits 1 through 9. The algraic operations in the cells must be fullfilled. There is only one solution. You can find it by logic.

Kropki Sudoku

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box has exactly one of each digit. If the difference between two cells is 1 then there is a white dot. If digit in a cell is the

half from a neighboring cell then there is a black dot. The dot between two cells with 1 and 2 can have any of these two colors. There is only one solution. You can find it by logic.

Other puzzles with different algebraic operations Algebraic Square

Fill in the grid so that every row and every column contains the digits 1 through 6. When combining the digits in the fields of a small area (in appropriate order) with the given operator, the given number has to result.

Smaller Example:

There is only one solution. You can find it by logic.

Pyramid

Fill the grid with the digits 1 to 9. The number in a cell must be the sum or the difference of the numbers in the both cells below the number. Each gray row has no repeated number. Each white row has at least one number that is repeated.

There is only one solution. You can find it by logic.

Navigator variants Navigator

Fill in the grid so that every row and every column contains the digits 1 through 6. The arrows show the location of the same number in the previous or next column or row.

Smaller example with the number 1 through 4.

There is only one solution. You can find it by logic.

Navigator Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The arrows show the location of the same number in the previous or next column or row. So for example, the arrow next to the 9 in the first column means that the 9 in the second column is in row 1 - 4. There is only one solution. You can find it by logic.

Navigator Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box will have exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The arrows show the location of the same number in the previous or next column or row. So for example, the arrow next to the 2 in the first column means that the 2 in the second column is in row 6 - 9. There is only one solution. You can find it by logic.

Renban, Number Chain Renban

Fill in the grid so that every row and every column contains the digits 1 through 5. The marked boxes must contain consecutive numbers, i. e., if such a box has three cells there can be 3, 4, 5 or 3, 5, 4, but not 3, 4, 1 in the cells.

Example:

There is only one solution. You can find it by logic.

Number Chain

Fill in the grid so that every row and every column contains the digits 1 through 9. Numbers going along the connected cells lines must be in increasing or decreasing consecutive order from one end to the other. So for example 3 - 4 -5 or 6 - 5 - 4 is possible, but 3 - 5 - 4 or 2 - 4 - 9 are not possible. There is only one solution. You can find it by logic.

Don't Arrow 123 Don't Arrow Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 3. Each row, column, and 3x3 box contains each digit three times. The red arrows indicate that the digit in that cell can't appear in the direction of the arrow. There is only one solution. You can find it by logic.

Corrections Sudoku Correction

Change some digits in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9 and so that no pair of changed digits is horizontal or vertical adjazent (diagonally adjazent changed cells are allowed). There is only one solution. You can find it by logic.

Rotary Sudoku

Turn 5 times a 3x3-box 90 degree to the left or right so that after that each row, column and 3x3-box has exactly one of each digit. There is only one solution. You can find it by logic.

Skyscraper Variants (without Skyscraper Sudoku) Skyscraper

Fill the grid with the digits 1 to 6. The digits represent the height of the skyscraper in each cell. Each row and column has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. There is only one solution. You can find it by logic.

Skyscraper X

Fill the grid with the digits 1 to 6. The digits represent the height of the skyscraper in each cell. Each row, column, 3x3-box and marked diagonal has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. There is only one solution. You can find it by logic.

Navigator Skyscraper

Fill the grid with the digits 1 to 6. The digits represent the height of the skyscraper in each cell. Each row and column has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point.

The arrows show the location of the same number in the previous or next column or row. So for example, the middle arrow in the first column means in column 2 is in row 4, 5 or 6 the same number as in the cell with the arrow. There is only one solution. You can find it by logic.

Nonconsecutive Skyscraper

Fill the grid with the digits 1 to 6. The digits represent the height of the skyscraper in each cell. Each row and column has exactly one of each digit. There are no neighbouring houses with consecutive skyscraper heights. The clues along the edges tell you how many Skyscrapers you can see from that vantage point. There is only one solution. You can find it by logic.

Sum Search Skyscraper

Fill the grid with the digits 1 to 6. The digits represent the height of the skyscraper in each cell. Each row and column has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The sum of the cells in the marked cages is always the same. There is only one solution. You can find it by logic.

Fillomino Skyscraper

Divide the grid into areas and write a number in every field. The numbers in the same area have to be the same and have to tell the number of fields in that area. Areas of same size my not touch horizontally or vertically, but diagonally. Given numbers may belong to the same area, and it's possible that there are areas, where no number is given, even with larger numbers as the once shown.

The clues along the edges tell you how many skyscrapers you can see from that vantage point.

Example:

There is only one solution. You can find it by logic.

Skyscraper Sudoku Variants Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. There is only one solution. You can find it by logic.

Skyscraper Sudoku X

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column, 3x3-box and marked diagonal has exactly one of each digit. The clues

along the edges tell you how many skyscrapers you can see from that vantage point. There is only one solution. You can find it by logic.

Argyle Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. In the marked diagonals no digit can appear more then once. The clues along the edges tell you how many skyscrapers you can see from that vantage point. There is only one solution. You can find it by logic.

Navigator Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box will have exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The arrows show

the location of the same number in the previous or next column or row. So for example, the arrow next to the 2 in the first column means that the 2 in the second column is in row 6 - 9. There is only one solution. You can find it by logic.

Nonconsecutive Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. There are no neighbouring houses with consecutive skyscraper heights. The clues along the edges tell you how many Skyscrapers you can see from that vantage point. There is only one solution. You can find it by logic.

Sum Search Skyscraper Killer

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The sums of the digits within each sub-region are equal to each other. In sub-regions there can't be the same digit repeated. There is only one solution. You can find it by logic.

10 Sum Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. Taking 180-degree rotational symmetry, the sum of mirrored skyscrapers must be 10. There is only one solution. You can find it by logic.

Even Odd Killer Skyscraper

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The coloured points tell you whether the sums in the marked cages are odd (yellow point) or even (green point). In cages there can't be the same digit repeated. There is only one solution. You can find it by logic.

Odd X Zero Killer Skyscraper

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The numbers tell you the sum of the marked cages. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The cells on both diagonals have odd digits. In cages there can't be the same digit repeated. There is only one solution. You can find it by logic.

Greater/Less Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box will have exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. Heights of skyscrapers must be placed according to greater (>) and less (<) signs. There is only one solution. You can find it by logic.

KiMo Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The digits in marked cages are the last digit of the sum of the digits in the cage. In cages there can't be the same digit repeated. There is only one solution. You can find it by logic.

KiMo 7 Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The digits in marked cages have always a sum that is a multiple of 7 (i. e. 7, 14, 21, 28, 35 or 42). In cages there can't be the same digit repeated. There is only one solution. You can find it by logic.

Difference Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the Skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The numbers between two cells give the difference of the heights. There is only one solution. You can find it by logic.

Max Quad Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The red points in the near of crosses where four cells meet each other show that the cell with the red point is greater then the three other ones. There is only one solution. You can find it by logic.

Even/Odd Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. Yellow cells must contain odd digits, green cells must contain even digits. There is only one solution. You can find it by logic.

Even/Odd Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. Yellow cells must contain odd digits, green cells must contain even digits. The green and yellow cells around the 9x9 grid tell you whether the number of skyscrapers you can see from that vantage point is even or odd. The clues in these cells tell you how many skyscrapers you can see from that vantage point. There is only one solution. You can find it by logic.

Even/Odd Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the Skyscraper in each cell. Each row, column and 3x3-box will have exactly one of each digit. The green and yellow cells around the grid tell you whether the number of skyscrapers you can see from that vantage point is even or odd. Yellow cells mean that you can see an odd number, green cells mean that you can see an even number. There is only one solution. You can find it by logic.

Jigsaw Skyscraper Sudoku Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and cells of the same color has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. There is only one solution. You can find it by logic.

Arrow Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The digit in a circle is the sum of the digits which are marked with its arrow. There is only one solution. You can find it by logic.

Creasing Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. Numbers going along grey lines must be in increasing or decreasing order from one end to the other. There is only one solution. You can find it by logic.

Disallowed Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. If a clue is cancelled with a red cross then you can't see this number of skyscrapers. There is only one solution. You can find it by logic.

Pandigital Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. Additional the rows form 9 correct arithmetic expressions reading from left to right. There is only one solution. You can find it by logic.

Sum Box Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. There are 6 boxes with a plus or minus sign where the sum or difference of the number formed by the first two rows is equal to the number formed in the third row of the same box. There is only one solution. You can find it by logic.

Tricky Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row and column 3x3-box has exactly one of each digit. Each 3x3 box contains 3 digits once, 3 digits twice and 3 digits missing. The clues along the edges tell you how many skyscrapers you can see from that vantage point. There is only one solution. You can find it by logic.

Zero Figure Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. In the blue areas there must always be the same set of digits (possibly in different orders). There is only one solution. You can find it by logic.

Figure Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. All occurrences of each

shape outlined in black (rotated and/or mirrored) must contain the same set of digits (possibly in different orders). None shape contains a repeated digit.There is only one solution. You can find it by logic.

Wheel Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The wheels in the grid contain each 4 values. These values will go in the cells the numbers are in. Doing this the wheels must be rotatated to the right position. (Not mirrored or changed the order of the digits.) There is only one solution. You can find it by logic.

Touchless Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The same digits can not touch each other diagonally. The clues along the edges tell you how many skyscrapers you can see from that vantage point. There is only one solution. You can find it by logic.

Combined Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box will have exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point.

In each 3x3 box their is a different rule to follow:

Upper left - Even/Odd Sudoku: Yellow cells must contain odd digits, green cells must contain even digits.

Upper centre - Min Max Quad Sudoku: The red points in the near of crosses where four cells meet each other show that the cell with the red points is greater then the three other ones. The blue rings in the near of crosses where four cells meet each other show that the cell with the blue ring is smaller then the three other ones.

Upper right - Arrow Sudoku: The digit in the circle is the sum of the digits which are marked with its arrow.

Centre left - Difference Sudoku: The numbers between two cells give the difference of the digits.

Centre - Navigator Sudoku: The arrows show the location of the same number in the previous or next column or row. So for example, the arrow in fifth column means that the same digit is in the sixth column in row 6 - 9.

Centre right - Greater/Less Sudoku: The inequality between each pair of digits must stand correct.

Lower left - Ratio Sudoku: The numbers between two cells give the ratio of the digits. For example 2/3 can stand for the following combinations of numbers in the adjazent cells: 2 - 3, 4 - 6, 6 - 9 and vice versa.

Lower centre - Killer Sudoku: Digits in a sub-region add up to the specified number.

Lower right - Creasing Sudoku: Numbers going along grey lines must be in increasing or decreasing order from one end to the other.

There is only one solution. You can find it by logic.

Disallowed 3 Skyscraper Windoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column, 3x3-box and cells of the same color have exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. There are no neighbouring cells with a difference of 3.

There is only one solution. You can find it by logic.

Line Skyscraper Sudoku

Fill the grid with the digits 1 to 9. The digits represent the height of the skyscraper in each cell. Each row, column and 3x3-box has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The sum of two cells with a bold line between them is always the same, the so called magic number. There is only one solution. You can find it by logic.

As easy as ABC As easy as ABC

Fill the grid with the letters A, B and C. Each row and column has exactly one of each letter digit and 2 empty cells. The clues along the edges tell you which digit you can see from that vantage point. There is only one solution. You can find it by logic.

Not as easy as ABCDE

Fill the grid with the letters A, B, C, D and E. Each row and column has exactly one of each letter and an empty cell. The clues along the edges tell you which position you can see the letter from that vantage point.

Smaller example:

There is only one solution. You can find it by logic.

Disallowed As easy as ABCD

Fill the grid with the letters A, B, C and D. Each row and column has exactly one of each letter and two empty cells. The clues along the edges tell you which first letter you can see from that vantage point. Letters with a red cross say that you can't see this letter as first. There is only one solution. You can find it by logic.

As easy as Sudoku Even Odd View Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The even clues along the edges tell you which digit is the first even digit from that vantage point. The odd clues along the edges tell you which digit is the first odd digit from that vantage point. There is only one solution. You can find it by logic. Smaller Example:

As easy as Sudoku

Fill the grid with the digits 1 to 6. Each row, column and 3x3-box has exactly one of each digit and 3 empty cells. The clues along the edges tell you which digit you can see from that vantage point. There is only one solution. You can find it by logic.

Symmetrical As easy as Sudoku

Fill the grid with the digits 1 to 6. Each row, column and 3x3-box has exactly one of each digit and 3 empty cells. The clues along the edges tell you which digit you can see from that vantage point. If you rotate the grid 180 degrees, the empty cells will appear at the same location as they appeared without the rotation. There is only one solution. You can find it by logic.

Last Number Last Number Sudoku X

Fill in the grid so that every row, every column, every 3x3 box and both diagonals contain the digits 1 through 9. A red arrow means that the digits are going up till they hit this number and for a cyan arrow they go down till they hit this particular number. There is only one solution. You can find it by logic. For example:

135247896 could get a red arrow with a 5 or a cyan arrow with a 1. 932415678 could get a red arrow with a 9 or a cyan arrow with a 2.

Last Number Sum Search Sudoku

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9.

A red arrow means that the digits are going up till they hit this number and for a cyan arrow they go down till they hit this particular number.

For example:

135247896 could get a red arrow with a 5 or a cyan arrow with a 1. 932415678 could get a red arrow with a 9 or a cyan arrow with a 2.

The sums of the digits within each sub-region are equal to each other. In sub-regions there can't be the same digit repeated. There is only one solution. You can find it by logic.

Minesweeper Variants Minesweeper

Locate the position of 20 mines in the grid. The numbers in the grid indicate the number of cells occupied by mines in adjazent cells, including diagonally. Mines are not on the numbered squares.

There is only one solution. You can find it by logic.

Magic Minesweeper Magic Minesweeper

Magic Minesweeper Knightsweeper Minesweeper Battleships At the Right Place Circular Minefield

Battleships Variants Battleships

Locate the position of a 10-ship fleet in the grid. The shapes of the ships are shown to the right of the grid. There is one 4x1 battleship, two 3x1 cruisers, three 2x1 destroyers and 4 1x1 submarines. The numbers beside the grid indicate the number of cells occupied by ships in each row, while the numbers below the grid indicate the number of occupied cells in each column. Ships may touch the edge of the board, but cannot touch each other, not even diagonally. Some cells are known to be water.

There is only one solution. You can find it by logic.

Battleships Wildcard Battleships "T it up" Battleships Tetris Battleships Squared Battleships Number Ships Battledice Minesweeper Battleships At the Right Place Crowded Battleships Lighthouse Battleships Single Fleet Subset Battleships Double Fleet Subset Battleships Tank Search

Submarines

Crossovers of Sudoku Variants and Battleships Variants Battleships Sudoku

Locate the position of the 10-ship fleet in the grid. The ships do not touch each other, even not diagonally. The numbers outside the grid indicate how many cells in that row or column contain parts of ships. The ship can not occupy the cells with given digits. Fill the grid also that every row, every column and every 3x3 box contain the digits 1 through 9. The ships contain the numbers given right of the grid. These numbers go from left to right, from right to left, from top to bottom or from bottom to top. There is only one solution. You can find it by logic.

Even Battleships Sudoku

Locate the position of a 10-ship fleet in the grid. The shapes of the ships are shown to the right of the grid. There is one 4x1 battleship, two 3x1 cruisers, three 2x1 destroyers and 4 1x1 submarines. The numbers beside the grid indicate the number of cells occupied by ships in each row, while the numbers below the grid indicate the number of occupied cells in each column. Ships may touch the edge of the board, but cannot touch each other, not even diagonally. Additional each cell has a number from 1 to 9. Place the digits so that each digit appears exactly once in each of the rows, columns and the nine outlined 3x3 regions. Cells with ship parts can only contain even numbers. There is only one solution. You can find it by logic.

Odd Battleships Killer

Locate the position of a 10-ship fleet in the left grid. The shapes of the ships are shown at the bottom of the left grid. There is one 4x1 battleship, two 3x1 cruisers, three 2x1 destroyers and 4 1x1 submarines. The numbers around the left grid indicate the number of cells occupied by ships in each row or column. Ships may touch the edge of the board, but cannot touch each other, not even diagonally. Additional each cell in the right grid has a number from 1 to 9. Place the digits so that each digit appears exactly once in each of the rows, columns and the nine outlined 3x3 regions. The numbers in the cages of the right grid are the sum of the cells in the cages. Cells with ship parts in the corresponding left grid can only contain odd numbers. There is only one solution. You can find it by logic.

"T it up" Battleships Sudoku

Locate the position of the five T-formss in the grid. The T-forms do not touch each other, even not diagonally. The numbers outside the grid indicate how many cells in that row or column contain parts of the T-forms. The T-forms can not occupy the cells with given digits. Fill the grid also that every row, every column and every 3x3 box contain the digits 1 through 9. The T-forms contain the numbers given right of the grid. The forms can be rotated, but to reflected. There is only one solution. You can find it by logic.

Mini Fleet Sudoku

Fill in the grid so that every row, every column and 3x3 box contains the digits 1 through 7 and two ship parts. So there are 18 ship parts for total. The ships are destroyer (2 unit ships) and submarines (1 unit ships). Ships cannot be adjazent to each other, not even diagonally. The numbers around the grid tell you how many ships you can see in this line. There is only one solution. You can find it by logic.

Fish Tanks Fish Tanks

Fill blue cells (water) in the grid . The numbers tell how much water cells are in this row or column. In a box (fish tank) the water falls down. In the same box within the same line either all cells must be water or none.

Example:

There is only one solution. You can find it by logic.

Lighthouse Variants Lighthouse Battleships

Locate the position of the 10-ship fleet in the grid. The ships do not touch each other, even not diagonally. The numbered squares are lighthouses, and indicate the total number of ship parts that are in the same row or column as the lighthouse. Ships can not touch the lighthouses, not even diagonally.

There is only one solution. You can find it by logic.

Tank Search

Ripple Effect, Number Block Ripple Effect

Every bold outlined section must contain the consecutive integers from 1 to the quantity of cells in that section inclusive. If two identical numbers appear in the same row or column, at least that many cells with other numbers must separate them. For example, two cells both containing '1' may not be orthogonally adjacent, but must have at least one cell between them with a different number. Two cells marked '2' in the same row or column must have at least two cells with other numbers between them in that row or column, and so on. There is only one solution. You can find it by logic.

Magic Sudoku

The following sudoku variant was invented by Alexandre Owen Muniz. Here is an own example of this theme.

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Each number inside the blue cells must be no larger than the number of blue cells in its 3x3 block - the same as the given within that block. Each major diagonal also contains the numbers 1-9. Note that the 9 givens make a magic square. There is only one solution. You can find it by logic.

Number Block

Every bold outlined section must contain the consecutive integers from 1 to the quantity of cells in that section inclusive. Adjazent cells must be different, even if they are diagonally adjazent. In rows or columns the digits can be repeated, There is only one solution. You can find it by logic.

Magic Spirals Magic Spiral

Fill in the grid so that every row and every column contains each digits 1 through 4 exactly once. Starting from the left bottom corner there must be along the spiral the number order 1 - 2 - 3 - 4 - 1 - 2 - ... - 3 - 4. There is only one solution. You can find it by logic.

Fill in the grid so that every row and every column contains each digits 1 through 5 exactly once. Starting from the left bottom corner there must be along the spiral the number order 1 - 2 - 3 - 4 - 5 - 1 - 2 - ... - 4 - 5. There is only one solution. You can find it by logic.

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Bossa Nova and Bossa Nova variants Bossa Nova

Fill the grid with natural numbers. In each cell the number is the sum of the gaps of this cell with its orthogonal adjazent neighbors.

Example:

There is only one solution. You can find it by logic.

Bossomino

Divide the grid into areas and write a number in every field. The numbers in the same area have to be the same and have to tell the number of fields in that area. Areas of same size my not touch horizontally or vertically, but diagonally. Given numbers may belong to the same area, and it's possible that there are areas, where no number is given, even with larger numbers as the once shown. In golden cells the number is the sum of the gaps of this cell with its orthogonal adjazent neighbors. In white cells the number can not be the sum of the gaps of this cell with its orthogonal adjazent neighbors.

Example:

There is only one solution. You can find it by logic.

Bossa Nova Skyscraper

Fill the grid with natural numbers. In each cell the number is the sum of the gaps of this cell with its orthogonal adjazent neighbors. The clues along the edges tell you how many skyscrapers you can see from that vantage point.

Example:

There is only one solution. You can find it by logic.

Bossdoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. In golden cells the number is the sum of the gaps of this cell with its orthogonal

adjazent neighbors. In white cells the number can not be the sum of the gaps of this cell with its orthogonal adjazent neighbors.

Smaller Example:

There is only one solution. You can find it by logic.

Anti Bossdoku

Fill in the grid so that every row, every column, and every 3x2 box contains the digits 1 through 6. In all cells the number can not be the sum of the gaps of this cell with its orthogonal adjazent neighbors.

Example:

There is only one solution. You can find it by logic.

Hitori Hitori

Paint out some cells so that there are no duplicate numbers in any row or column. Painted-out (black) cells cannot be connected orthogonally. All un-painted squares must be connected, horizontally or vertically, to create a single shape. There is only one solution. You can find it by logic.

Sudoku Crossovers with Chess Black Knight Sudoku (9 Knights)

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 8 and a chess knight. All knights defend at least one other. There is only one solution. You can find it by logic.

White Knight Sudoku (9 Knights)

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 8 and a chess knight. No knights attack each other. There is only one solution. You can find it by logic.

Anti-Knight Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. The same numbers are not "chess-knight move connected". There is only one solution. You can find it by logic.

Horsudoku

Fill in the grid so that every row, every column and 3x3 box contain the digits 1 through 9. All knights attack at least one other cell with the same number in the chess knight distance. The numbers at the left and at the top are the sum of cells with a knight. There is only one solution. You can find it by logic. Smaller Example:

Queen Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 8 and a chess queen. No queens attack each other. There is only one solution. You can find it by logic.

Bishop Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 8 and a chess bishop. All bishop defend at least one other. There is only one solution. You can find it by logic.

Queen Knights Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 8 or a chess piece (1 queen and 8 knights). No chess pieces attack each other. There is only one solution. You can find it by logic.

White King Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 8 and a chess king. Kings can be neither orthogonally nor diagonally adjazent. There is only one solution. You can find it by logic.

Sudoku with educational background History Sudoku

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The colored cells mark the years of birth or death of some well-known composers. You can solve the sudoku, if you know at least the century of birth or death.

There is only one solution. You can find it by logic.

Word Sudoku Word Search Sudoku

Fill in the grid so that every row, every column, and every 3x3 box contains the letters A, C, E, F, H, L, M, S, and Z. If your sudoku is solved you can find 7 animal names in german language: HUMMEL (engl.: bumblebee), MAUS (engl.: mouse), FUCHS (engl.: fox), LUCHS (engl.: lynx), ELCH (engl.: elk, moose), SAU (engl.: sow) and LAUS (engl.: cootie) in vertical, horicontal or diagonal direction by word search. There is only one solution. You can find it by logic.

Wordoku

Fill in the grid so that every row, every column, and every 3x3 box contains the letters A, B, E, G, L, N, R, T, and U. If your sudoku is solved you can find in the colored cells a small town in Thuringia (Germany). There is only one solution. You can find it by logic.

Codedoku

Fill in the grid so that every row, every column, and every 3x3 box contains the letters A, C, D, E, H, I, M, R, and T. If your sudoku is solved you can find in the colored cells a sentence by Isaac Babel (in german language). There is only one solution. You can find it by logic.

Sudoku with divided cells 0-9 Sudoku 0-9 Sudoku Tangram Sudoku Double Cell Square Millars Two-Doku Double Cell Sudoku 24 cells Rokudoku

Sudoku with combined cells Sudoku Parquet

Fill in the grid so that every row, every column, every 4 x 4 box, the green, the orange and the blue fields contain the digits 1 through 9.

There is only one solution. You can find it by logic.

Sudoku Parquet Sudoku Parquet Tablecloth Sudoku

Fill in the grid so that every row, every column of the 7x7 grid completed with both adjacent border fields contain the digits 1 through 9. There is only one solution. You can find it by logic.

Optimization Sudoku Sudoku Maze

Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. After that search for a way from the upper left to the bottom right corner. On this way make steps between orthogonally adjazent cells so that the sum of the numbers in the cells you touch is minimal. There is only one solution. You can find it by logic.

Doubles and Triples

Fill in the grid so that every row, every column, and every marked region contains the digits 1 through 6. If the ratio of two adjazent cells is 1:2 then you get 2 points (in the example marked with blue circles). If the ratio of two adjazent cells is 1:3 then you get 3 points (in the example marked with red circles). So in the example you would get 12 * 2 + 6 * 3 = 42 points. Attempt to maximize your points. My record is 84 points. Example:

Sudoku with Repitition Pair Pair Box Sudoku

Fill the grid with the digits 1 to 9. Each row and each column has exactly one of each digit. Each red region must contain 1 pair of numbers. Each cyan region must contain 2 pairs of numbers. Each yellow region must contain 3 pairs of numbers. There is only one solution. You can find it by logic.

Tricky Sudoku Tricky Sudoku Tricky Skyscraper Sudoku Bi-diagonal Sudoku 123 Sudoku 123 Sudoku 123 Sudoku 123 Don't Arrow Sudoku 12345 Sudoku 12345 Sudoku 1-2-3 Rokudoku 2-3-4 Sudoku 2-3-4 Sudoku 2-3-4 Sudoku Spherical 2-3-4 Sudoku 1-2-3-4 Sudoku 1-2-3-4 Sudoku 1-2-3-4 Jigsaw Sudoku 3 Star Sudoku Sudoku 007 1-3-5 Sudoku 4-5 Sudoku 1-2-6 Sudoku Neinerlaa

Christmas Eve eat many Erzgebirgians the traditional Neinerlaa (English: of 9 kinds, speak: 'nein' like the number word 'nine', 'er' like the end of the words 'number', 'butter' and 'laa' with a long 'a'). A Neinerlaa is consisting of 9 courts, which all must be served simultaneously, and there are a lot rules around this. When we think to make a puzzle about a Neinerlaa theme we could think naturally about Sudoku, the puzzle with numbers of 9 kinds. Here I have a similar Neinerlaa prepared.

Fill in the grid with the letters of the word 'Neinerlaa' in each row, column and each 3x3 box. That means in each column, row and every 3x3 box exist the letters N, E and A exactly two times and the letters I, R and L exactly once.

There is only one solution. You can find it by logic.

Worms Worms

Connect in the grid all dots in pairs in such a way that all cells are filled. Each path (worm) has to make a 90 degree turn in every cell it travels through and must contain at least one turn.

Example:

There is only one solution. You can find it by logic.

Sudoku X Worms

Connect in the left grid all dots in pairs in such a way that all cells are filled. Each path (worm) has to make a 90 degree turn in every cell it travels through and must contain at least one turn. After that fill in the right grid so that every row, every column, every 3x3 box and both diagonals contain the digits 1 through 9. If two cells are in the left grid in the same path (worm) then the corresponding cells in the right grid must be different.

There is only one solution. You can find it by logic.

One or All One or All

Fill in the grid the digits 1 through 3. The digits in the boxes must be either all equal or all different. Horizontally or vertically adjazent cells of different boxes must be different.

There is only one solution. You can find it by logic.

One or All One or All

Sudoku with multiple grids Multigrid Sudoku

Fill each 4x4 grid with the digits 1 to 4 so that each row and column of each 4x4 grid has each digit. Neighboring squares from separate grids do not have the same number. There is only one solution. You can find it by logic.

Twin Corresponding Sudoku

Fill in the grids so that every row, every column and 3x3 box contains the digits 1 through 9. There must be a one-to-one correspondence between both twins, i. e., in all positions with a certain digit in the first grid must be in the corresponding position in the second grid also always the same digit (possibly another as in the first grid). There is only one solution. You can find it by logic.

Twin Corresponding Creasing Sudoku

Fill in the grids so that every row, every column and 3x3 box contains the digits 1 through 9. There must be a one-to-one correspondence between both twins, i. e., in all positions with a certain digit in the first grid must be in the corresponding position in the second grid also always the same digit (possibly another as in the first grid). Numbers going along grey lines must be in increasing or decreasing order from one end to the other. There is only one solution. You can find it by logic.

Twin Corresponding Zero Killer Sudoku

Fill in the grids so that every row, every column and 3x3 box contains the digits 1 through 9. The sum of the digits within each sub-region is equal to the specified number. There must be a one-to-one correspondence between both twins, i. e., in all positions with a certain digit in the first grid must be in the corresponding position in the second grid also always the same digit (possibly another as in the first grid). There is only one solution. You can find it by logic.

Polyomino Sudoku

Fill in the grid so that in every row and every column as well of the yellow as of the green square contains the digits 1 through 5. Additionally every marked region contains the digits 1 through 5.

There is only one solution. You can find it by logic.

Polyomino Sudoku 4 from 3 Sudoku Combined Circuit Sudoku

Fill in the grid so that each grid every row, every column, and every 3x2 box contains the digits 1 through 6. The cells with circles have the same digit as the corresponding cell in the next grid. (The order is marked by arrows).

In each grid their is a differet rule to follow:

Upper left - Figure Rokudoku: All occurrences of each shape outlined in black (rotated and/or mirrored) must contain the same set of digits (possibly in different orders). None shape contains a repeated digit.

Upper right - Equal Killer: The equal signs mark the equality between the sums of the digits of the sub-regions.

Lower right - Rokudoku X: The digits in both marked diagonals must be different. Lower left - Greater/Less Rokudoku: The inequality between each pair of digits must

stand correct.

There is only one solution. You can find it by logic.

4x4x4 Sudoku

Fill in the grids so that every row, every column, and every 2x2 box contains the digits 1 through 4. On the same place in the grids (i.e. in cells with the same color) also the digits must be 1 through 4.

There is only one solution. You can find it by logic.

Overlapping Sudoku Twodoku

Fill in both grids so that every row, every column, and every 3x3 box contains the digits 1 through 9. There is only one solution. You can find it by logic.

Conjoined Sudoku

Mechanical Variants Tetris Sudoku Puzzle X

Locate the position of the 16 T-forms in the grid. The T-forms fill all cells and don't overlap. The forms can be rotated but not reflected. Every row, every column, every marked 4x2 box and both main diagonals contain the digits 1 through 8. The place of 3 T-forms is given. There is only one solution. You can find it by logic.

Puzzle Sudoku

Place the given pieces into the grid without overlapping them. Then fill in the grid so that every column, and every 3x3 box contains the digits 1 through 9. The four corner boxes of the finalized grid have been marked with dots on the pieces too. There is only one solution. You can find it by logic.

Sliding Sudoku

Fill the grid with the digits 1 to 9. Each row, column and 3x3-box has exactly one of each digit. The strips in the left and in the top mark the distance and order of the two digits of this strip in this row or column. There is only one solution. You can find it by logic.

Combined Sudoku Combined Sudoku Combined Sudoku Smash Sudoku Combined Skyscraper Sudoku Combined Circuit Sudoku

Three-Dimensional Sudoku Sudoku Cube (4x4x4) Sudoku Cube (4x4x4) Sudoku Cube (4x4x4) Krychle Sudoku (4x4x4) Krychle Sudoku (4x4x4) Krychle Sudoku (9x9x9)

Sudoku Cube (6x6x6) 4x4x4 Square 4x4x4 Sudoku 5x5x5 Square Cube Sudoku Pentagram Sudoku

Circular Sudoku Spiral Sudoku Nonconsecutive Spider Sudoku Tape Sudoku Tape Sudoku Christmassy Windows Picture "Bergmaa" Double Ring Sudoku Double Ring Sudoku Target Sudoku Target Sudoku Circular Diagonal Sudoku Circular Box Sudoku Circular Sudoku Nonconsecutive Circular Sudoku Clock Sudoku

Honeycomb Sudoku Circle Chain Sudoku Honey Flower Sudoku Honeycomb Sudoku Honey Sudoku Loop de Loop

Diary Sudoku Diary Sudoku

Fill in the grid so that every of the lines in the three marked directions and every circle contains the digits 1 through 6.

There is only one solution. You can find it by logic.

Hexagonal Sudoku Sudoku Hexagon Sudoku Hexagon Greater Less Hexagon Hexagonal Killer ^ Hexagonal Killer Hexagonal Killer Hanidoku Hanidoku Hanidoku Septoku Septoku Septoku Septoku Kropki Hexagon Hexdoku Hexdoku

Triangular Sudoku

Triangle Sudoku Sudoku Star Sudoku Bunch of Grapes Sudoku Bunch of Grapes Triangular Hexdoku Triangular Hexdoku Sudoku Diamond Sudoku Diamond Triangular Sudoku Snowflake Triangular Sudoku Snowflake Triangular Sudoku Snowflake

Sudoku with unusual form Sudoku Ship Dollar Sudoku Dollar Sudoku Sudoku Heart Pseudoku Pseudoku Criss-Cross Pseudoku Spherical 2-3-4 Sudoku

Erzgebirgian Christmas Christmassy Windows Picture "Bergmaa" Angel Domino Neinerlaa

Christmas Eve eat many Erzgebirgians the traditional Neinerlaa (English: of 9 kinds, speak: 'nein' like the number word 'nine', 'er' like the end of the words 'number', 'butter' and 'laa' with a long 'a'). A Neinerlaa is consisting of 9 courts, which all must be served simultaneously, and there are a lot rules around this. When we think to make a puzzle about a Neinerlaa theme we could think naturally about Sudoku, the puzzle with numbers of 9 kinds. Here I have a similar Neinerlaa prepared. Fill in the grid with the letters of the word 'Neinerlaa' in each row, column and each 3x3 box. That means in each column, row and every 3x3 box exist the letters N, E and A exactly two times and the letters I, R and L exactly once. There is only one solution. You can find it by logic.

Last Additions (newest first) Maxi-Sudoku (15x15) Even Odd View Sudoku Maxi Sudoku (10x10) Bossomino Bossomino Bossa Nova Skyscraper Anti Bossdoku Anti Bossdoku Bossdoku Bossdoku Bossa Nova Bossa Nova Hexagonal Killer Hexagonal Killer Colorful Borders Submarines Gardens Gardens Anfitto Anfitto Up and Down Sudoku Up and Down Up and Down Algebraic Square Fillomino Skyscraper Fillomino Skyscraper Horsudoku Girandola Sudoku Horsudoku Even Odd Fillomino Fillomino Septoku Hexagonal Killer

Greater Less Hexagon Kropki Hexagon Magic Minesweeper Magic Minesweeper Magic Minesweeper Daisho Killer Daisho Neinerlaa Angel Domino Christmassy Windows Picture "Bergmaa" Domino Search Domino Search Domino Search Address Number Total Rising Total Rising Total Rising Disallowed As easy as ABCD Not as easy as ABCDE Krychle Sudoku (9x9x9) Battledice Navigator Circular Minefield ABCD Knot Krychle Sudoku (4x4x4) Krychle Sudoku (4x4x4) 4x4x4 Sudoku Fish Tanks Bent between Pseudo Killer Zero Killer X Tank Search Double Fleet Subset Battleships Single Fleet Subset Battleships Lighthouse Battleships Knightsweeper Minesweeper Crowded Battleships Minesweeper Battleships At the Right Place Tetris Sudoku Puzzle X Wildcard Battleships Odd Battleships Killer Tetris Battleships Offset Sudoku "T it up" Battleships Sudoku "T it up" Battleships Battleships Sudoku Retro Killer Pencil Sudoku

Sliding Sudoku Kropki Sudoku Sudoku Sudoku Squared Battleships Shikaku Rekuto Even Battleships Sudoku Battleships Worms Battleships As easy as ABC As easy as ABC As easy as ABC Rokudoku Logi-5 (Pento-Sudoku) Rokudoku Frame Product Sudoku Rotary Sudoku Sum Search Skyscraper Shen Sudoku Jing Sudoku Dan Sudoku King Sudoku Honey Sudoku Number Ships Where is the biggest?

Fill in the grid with the digits 1 through 9. Each number should be used only once. The number in the coloured square is the sum of the four adjazent cells. The arrows show the biggest of the four adjazent digits. There is only one solution. You can find it by logic.

Where is the biggest? Magic Spiral Magic Spiral Nonconsecutive Skyscraper Navigator Skyscraper

Skyscraper X Skyscraper Sum Line Sudoku Zhong Sudoku Shi Sudoku Black Jack Sudoku Fortress Sudoku Fortress Sudoku Pyramid Pyramid Line Skyscraper Sudoku Equal Value Zero Killer Neighbouring Sudoku Mudan Sudoku Bagua Zero Killer Bagua Sudoku Kropki Sudoku Asterisk Sudoku X Asterisk Sudoku Pentagram Sudoku Diary Sudoku Non-Consecutive Windoku Sight Sudoku Disallowed 3 Skyscraper Windoku Disallowed 3 Windoku Last Number Sum Search Sudoku 24 cells Rokudoku Last Number Sudoku X Sudoku Snakes 123 Don't Arrow Sudoku Sudoku X Worms Combined Circuit Sudoku Larger/Smaller Sudoku X 4 from 3 Sudoku Old Lace Sudoku Snake Sudoku Snake Sudoku Snake Sudoku Tablecloth Sudoku Algebraic Sudoku X Touchless Skyscraper Sudoku Touchless Sudoku Polyomino Sudoku Polyomino Sudoku Triangular Sudoku Snowflake Triangular Sudoku Snowflake Triangular Sudoku Snowflake Consecutive Even Odd Sudoku X Sudoku Parquet Sudoku Parquet

Sudoku Parquet Double Cell Sudoku

LinksExternal pages with placement puzzles

(c) Uwe Wiedemann (wiedemann@sachsentext..de)

column, every row and every 3x3 box must contain those digits 1 to 9. The printed top left-hand numbers is sum of numbers in joined squares by dotted lines. The same number doesn't enter in joined squares by dotted lines.

[Hints] Hints to solve Sum Number Place are hidden in the joined squares where only one combination of numbers is possible. Look for the numbers used by the combination and the numbers never used. Every column, every row and every 3x3 box = 45(1+2+3+4+5+6+7+8+9)

[How to solve]

[How to solve]

NEW: 08/10/2005

Hints: No digit is ever repeated in a Sum area. All combinations and Sudoku rules.

[How to solve]

To next page [Sum Number Place (Equal sign and sign of inequality) ]

Sum Number Place (Equal sign and sign of inequality) Rules]

Every column, every row and every 3x3 box must contain those digits 1 to 9.

(The sum of numbers in joined squares of dotted lines is not printed at all.)

The same number doesn't enter in joined squares of dotted lines.

"=" is equal by the sum in the dotted line. "<>" is large or small by the sum in the dotted line.

NEW: 30/10/2005

[Hints] 2cells sum= 3 to 17 3cells sum= 6 to 27 4cells sum=10 to 30 5cells sum=15 to 35

NEW: 03/11/2005

[Hints] 4cells sum=10 to 30 5cells sum=15 to 35 7cells sum=28 to 42

To next page [Cross Sums(Kakuro)]

Geometry Number Place] Fill in the diagram with the figures 1 to 9 so that the figures in all rows and all columns as well as in each specially marked from differ from each other. Diagonally the repeating of the figures is allowed.