9
7
2
7
9
5
8
1
7
6
7
4
8
2
8
6
2
6
3
7
7
1
6
2
2
4
8
3
6
7
Time 00:00
Mistakes 0
Ready
Hard Sudoku #81
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 30 of 81 |
| Technique score | 148.1 |
| Rated techniques | 8 |
Techniques this puzzle needs
Where to start
The first move on this board is a Hidden Single: In this row 5, 7 can only go in one cell, so it must go there.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.