How to play SUDOKUadapted from www.activityvillage.co.uk

Tilda Rosander

3 1

2

2

1 3

2. To finish this Sudoku you must make every column, rown and mini-grid contain the numbers 1, 2,3 and 4 one time. The numbers can be in any order.

1. This easy 4 by 4 Sudoku consists of 4 mini-grids of 4 squares each.

1

1

2

2

3

3

4

4

4

4

3. Now we are going to look at some strategies that you can use to find out the missing number.

3 1

2

2

1 3

2

3

4

1. Let's start by looking at the third column.

a) We already have the digits 1 and 2 in that column so we need 3 and 4.

b) We can't put a 3 in the top square since there is already a three in that row.

c) So the top square must be a 4.

d) Since all columns have to have the digits 1, 2, 3 and 4 the missing digit is 3. 2. Now we can work out what goes in the

top right corner.

a) Looking at the top row we see that we already have 3, 1 and 4.

b) The only missing digit is 2.

3 1

2

2

1 3

1

2

2

3

3

4

4

1. We continue by looking at the third column.

a) We already have the digits 1 and 2 in that column so we need 3 and 4.

b) The bottom row already has a 3 so we have to put the 4 there.

c) Now only one digit is missing in the column and that is 3.

d) The bottom row is now only missing one digit and that is 2.

2. Remember that each mini-grid must have the digits 1, 2, 3 and 4 in them too.

a) Looking at the top right mini-grid we see that we already have 4, 2 and 3.

b) The only missing digit is 1.

3 1

2

2

1 3

1

1

2

2

3

3

4

4

4

4

1. We continue filling in the mini-grids.

a) Looking at the top left mini-grid we see that we already have 3, 1 and 2. So the only missing digit is 4.

b) We can double-check this by making sure that the second row doesn't have any doubles.

2. Now we can choose what strategy we want to use to fill in the missing digits.

a) The bottom left mini-grid is missing a 1.

b) The last column is missing a 4.

3. Now it’s all done!