5
8
2
2
5
6
1
6
3
5
9
7
4
8
3
9
3
2
4
8
1
2
5
9
4
7
4
6
Time 00:00
Mistakes 0
Ready
Hard Sudoku #179
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 28 of 81 |
| Technique score | 101.2 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Hidden Single: In this row 4, 2 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.