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

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


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