9
3
4
7
2
6
1
4
5
8
5
6
4
6
7
1
9
8
2
3
9
5
2
8
3
Time 00:00
Mistakes 0
Ready
Hard Sudoku #191
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 25 of 81 |
| Technique score | 121.6 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 6, column 4 already sees all eight other digits in its row, column and box, so it can only be 4.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.