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Sudoko is a mental exercise that uses numbers and groups of numbers that you place in a particular order. Since there is only one way to complete a sudoku puzzle correctly, it does require thinking.
Sudoku has been used to improve cognitive functioning and to slow down the mental effect of aging. What a deal! You get two benefits for the price of one. The sudoku puzzles you will find here on our site are free for you to download, print and complete.
How Sudoku Works
A sudoku puzzle uses the numbers 1, 2, 3, 4, 5, 6, 7, 8, and 9. You write the numbers in blank squares.
The numbers 1, 2, 3, 4, 5, 6, 7, 8, and 9 can only be used once. To solve the above puzzle you would write in the three missing numbers: 2, 6 and 8.
It's Not that Simple
The example above is known as ONE 3 x 3 square. A real sudoku puzzle has NINE 3 x 3 squares. Each 3 x 3 square must have all 9 numbers and CANNOT have any number more than once.
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
4 |
5 |
6 |
7 |
8 |
9 |
1 |
2 |
3 |
7 |
8 |
9 |
1 |
2 |
3 |
4 |
5 |
6 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
1 |
5 |
6 |
7 |
8 |
9 |
1 |
2 |
3 |
4 |
8 |
9 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
1 |
2 |
6 |
7 |
8 |
9 |
1 |
2 |
3 |
4 |
5 |
9 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
It's Not that Simple, Either!
Each horizontal line must have all 9 numbers and use each number only once. And each vertical line must use all 9 numbers, using each one only once.
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
4 |
5 |
6 |
7 |
8 |
9 |
1 |
2 |
3 |
7 |
8 |
9 |
1 |
2 |
3 |
4 |
5 |
6 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
1 |
5 |
6 |
7 |
8 |
9 |
1 |
2 |
3 |
4 |
8 |
9 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
1 |
2 |
6 |
7 |
8 |
9 |
1 |
2 |
3 |
4 |
5 |
9 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
Click here to complete a sample Sodoku Quiz online.
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