5
1
3
3
9
4
8
1
1
9
8
2
4
5
8
6
3
5
4
9
7
1
4
6
4
3
7
2
Time 00:00
Mistakes 0
Ready
Hard Sudoku #39
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 28 of 81 |
| Technique score | 98.5 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 5, 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.