8
9
7
2
1
5
8
2
3
9
8
3
5
8
9
4
7
1
7
6
7
3
5
8
3
1
5
2
8
7
Time 00:00
Mistakes 0
Ready
Hard Sudoku #143
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 30 of 81 |
| Technique score | 96.9 |
| Rated techniques | 4 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 1, column 6 already sees all eight other digits in its row, column and box, so it can only be 6.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.