4
5
3
7
1
3
4
5
4
7
8
1
2
5
9
1
4
6
5
1
9
7
2
1
4
Time 00:00
Mistakes 0
Ready
Hard Sudoku #31
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 25 of 81 |
| Technique score | 141.1 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Hidden Single: In this row 5, 4 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.