3
9
4
5
2
9
1
6
3
7
2
8
4
9
4
8
1
4
7
9
3
6
1
2
3
8
Time 00:00
Mistakes 0
Ready
Hard Sudoku #66
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 26 of 81 |
| Technique score | 117.5 |
| Rated techniques | 4 |
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 7.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.