8
6
9
1
6
6
5
4
8
2
8
4
8
3
9
2
8
2
7
4
5
4
7
3
5
6
Time 00:00
Mistakes 0
Ready
Hard Sudoku #224
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 26 of 81 |
| Technique score | 109.1 |
| Rated techniques | 4 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 9, column 8 already sees all eight other digits in its row, column and box, so it can only be 1.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.