1
7
5
8
6
8
2
3
1
6
8
3
4
5
6
4
5
2
3
8
2
7
5
1
8
7
6
1
4
Time 00:00
Mistakes 0
Ready
Hard Sudoku #133
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 29 of 81 |
| Technique score | 105.5 |
| Rated techniques | 6 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 1, column 4 already sees all eight other digits in its row, column and box, so it can only be 9.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.