7
5
7
1
4
9
2
8
2
7
1
4
8
4
6
8
9
2
7
4
9
6
5
3
1
5
Time 00:00
Mistakes 0
Ready
Hard Sudoku #231
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 26 of 81 |
| Technique score | 114.5 |
| Rated techniques | 6 |
Techniques this puzzle needs
Where to start
The first move on this board is a Hidden Single: In this row 3, 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.