Very difficult sudoku #1631
| 1 | 9 | 3 | 6 | |||||
| 5 | 4 | 9 | 2 | |||||
| 2 | ||||||||
| 5 | 6 | 2 | ||||||
| 4 | 7 | 2 | 3 | |||||
| 3 | 9 | 8 | ||||||
| 6 | ||||||||
| 7 | 1 | 3 | 9 | |||||
| 3 | 4 | 7 | 1 |
Puzzle Completed
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