2
7
5
3
9
1
1
8
7
6
5
8
1
3
3
2
8
1
9
3
6
4
7
2
4
6
6
6
1
7
9
3
Time 00:00
Mistakes 0
Ready
Hard Sudoku #227
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 32 of 81 |
| Technique score | 92.6 |
| Rated techniques | 4 |
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 4.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.