Very difficult sudoku #3616
| 2 | 9 | 1 | ||||||
| 2 | 7 | 3 | 6 | 5 | 9 | |||
| 2 | 1 | |||||||
| 4 | 5 | 3 | 7 | |||||
| 1 | 3 | 7 | 4 | 6 | ||||
| 2 | 1 | 8 | 4 | 6 | 5 | |||
| 5 | 6 | 1 | ||||||
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