6
2
4
1
3
1
6
7
2
3
8
1
9
1
9
2
5
9
3
7
4
3
7
1
5
2
5
4
9
1
Time 00:00
Mistakes 0
Ready
Hard Sudoku #59
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 30 of 81 |
| Technique score | 122.3 |
| Rated techniques | 7 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 4, column 7 already sees all eight other digits in its row, column and box, so it can only be 2.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.