Very difficult sudoku #1678
| 5 | 6 | 8 | ||||||
| 1 | 6 | |||||||
| 6 | 3 | 2 | ||||||
| 4 | 7 | 8 | 2 | |||||
| 3 | 9 | 7 | ||||||
| 8 | ||||||||
| 5 | 7 | 6 | ||||||
| 6 | 3 | 5 | ||||||
| 1 | 9 | 7 |
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