4
6
2
5
8
6
3
8
1
1
5
6
7
8
7
3
5
2
9
5
7
2
2
8
1
4
Time 00:00
Mistakes 0
Ready
Hard Sudoku #229
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 26 of 81 |
| Technique score | 134.6 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Hidden Single: In this row 1, 8 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.