1
2
9
6
5
4
1
3
7
4
6
6
2
5
4
2
9
1
3
7
3
5
6
2
8
5
Time 00:00
Mistakes 0
Ready
Hard Sudoku #221
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 26 of 81 |
| Technique score | 109.7 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 1, column 1 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.