7
8
9
1
1
6
5
2
9
3
8
9
6
4
8
8
5
8
7
6
1
4
9
9
7
Time 00:00
Mistakes 0
Ready
Hard Sudoku #177
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 25 of 81 |
| Technique score | 148.6 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 1, column 5 already sees all eight other digits in its row, column and box, so it can only be 3.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.