1
7
9
3
6
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8
5
7
2
8
1
6
3
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5
4
6
6
6
7
8
5
4
2
1
Time 00:00
Mistakes 0
Ready
Hard Sudoku #79
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 26 of 81 |
| Technique score | 134.6 |
| Rated techniques | 7 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 1, column 6 already sees all eight other digits in its row, column and box, so it can only be 8.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.