9
3
1
1
7
8
6
5
2
8
2
9
7
3
1
7
8
5
1
4
4
2
5
6
2
5
Time 00:00
Mistakes 0
Ready
Hard Sudoku #171
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 26 of 81 |
| Technique score | 118.7 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 3, column 5 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.