# How to play SUDOKU adapted from activityvillage.co.uk - PowerPoint PPT Presentation

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How to play SUDOKU adapted from www.activityvillage.co.uk. Tilda Rosander. 1. This easy 4 by 4 Sudoku consists of 4 mini-grids of 4 squares each. 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.

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How to play SUDOKU adapted from activityvillage.co.uk

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

Tilda Rosander

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

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.

4

2

3

1

4

3

2

1

3

4

1

2

2

4

1

3

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

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

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

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

• So the top square must be a 4.

• Since all columns have to have the digits 1, 2, 3 and 4 the missing digit is 3.

4

2

3

1

3

2

2

1

3

• Now we can work out what goes in the top right corner.

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

• The only missing digit is 2.

• We continue by looking at the third column.

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

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

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

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

4

2

3

1

3

2

1

3

2

2

4

1

3

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

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

• The only missing digit is 1.

• We continue filling in the mini-grids.

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

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

4

2

3

1

4

3

2

1

1

3

2

4

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

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

• The last column is missing a 4.

2

4

1

3

• Now it’s all done!