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

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


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