Very difficult sudoku #1664
| 4 | 8 | 5 | ||||||
| 2 | 7 | |||||||
| 7 | 1 | 9 | 4 | |||||
| 2 | 4 | |||||||
| 8 | 7 | |||||||
| 1 | 9 | 8 | 6 | 7 | ||||
| 3 | 6 | |||||||
| 8 | 7 | 6 | 3 | 1 | ||||
| 1 | 7 | 8 |
Puzzle Completed
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