7
3
1
3
8
1
5
7
4
9
1
4
2
3
8
6
2
1
4
5
7
8
9
1
4
5
Time 00:00
Mistakes 0
Ready
Hard Sudoku #90
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 26 of 81 |
| Technique score | 128.3 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 2, column 9 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.