4
7
6
1
9
6
9
8
1
5
6
3
7
4
2
5
7
8
3
9
5
4
1
8
9
3
Time 00:00
Mistakes 0
Ready
Hard Sudoku #37
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 26 of 81 |
| Technique score | 99.8 |
| Rated techniques | 4 |
Techniques this puzzle needs
Where to start
The first move on this board is a Locked Candidates: In this column 7, 6 can only appear inside one box. That removes 6 from the rest of that box.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.