4
1
5
4
6
2
5
6
8
1
8
8
2
5
4
7
3
1
9
7
3
4
2
1
9
Time 00:00
Mistakes 0
Ready
Hard Sudoku #13
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 25 of 81 |
| Technique score | 147.1 |
| Rated techniques | 6 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 8, column 2 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.