Sudoku
Sudoku is logical game with digits. The name come from abbreviation "suji wa dokushin ni kagiru", meaning "the digits must occur only once".

7 | 3 | 9 | 4 | 1 | ||||
1 | 6 | 2 | 7 | 3 | ||||
4 | 7 | 1 | ||||||
4 | 3 | 1 | 6 | |||||
9 | 8 | 5 | 6 | 7 | ||||
5 | 2 | 4 | 8 | 9 | ||||
5 | 6 | 3 | 4 | 2 | ||||
5 | 7 | 3 | 8 |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |


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