9
6
3
6
1
8
8
2
6
4
3
2
7
8
5
1
3
7
5
4
6
3
9
5
2
1
Time 00:00
Mistakes 0
Ready
Hard Sudoku #173
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 26 of 81 |
| Technique score | 120.5 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 9, column 1 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.