9
8
4
3
5
2
1
9
3
9
3
2
6
3
9
1
7
5
2
6
9
8
7
5
6
3
1
6
8
2
Time 00:00
Mistakes 0
Ready
Hard Sudoku #91
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 30 of 81 |
| Technique score | 99.9 |
| Rated techniques | 7 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 5, column 7 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.