7
9
6
2
3
5
9
8
5
7
6
4
3
4
5
1
1
6
5
3
2
9
3
4
8
1
7
6
Time 00:00
Mistakes 0
Ready
Hard Sudoku #57
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 28 of 81 |
| Technique score | 140.2 |
| Rated techniques | 6 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 5, column 5 already sees all eight other digits in its row, column and box, so it can only be 6.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.