4
9
7
2
8
6
1
2
1
2
9
7
1
3
8
3
7
6
3
4
2
5
6
9
4
1
Time 00:00
Mistakes 0
Ready
Hard Sudoku #114
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 26 of 81 |
| Technique score | 101.9 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 5, column 7 already sees all eight other digits in its row, column and box, so it can only be 5.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.