The goal of Sudoku is to fill in every cell in a 9x9 grid so that the numbers 1 through 9 appear once, and only once, in each row, column and 3x3 block. Below is an example of an unsolved sudoku.
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9 |
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4 |
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8 |
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1 |
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| 7 |
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5 |
3 |
8 |
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2 |
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7 |
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1 |
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8 |
| 1 |
8 |
5 |
3 |
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6 |
4 |
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| 6 |
4 |
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2 |
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3 |
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| 4 |
5 |
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6 |
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7 |
8 |
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| 9 |
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3 |
4 |
1 |
8 |
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2 |
6 |
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