7
6
1
5
4
1
2
3
8
7
8
1
5
8
3
6
4
4
5
2
4
2
9
7
5
2
Time 00:00
Mistakes 0
Ready
Hard Sudoku #83
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 26 of 81 |
| Technique score | 103.4 |
| Rated techniques | 4 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 1, column 9 already sees all eight other digits in its row, column and box, so it can only be 9.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.