2
8
8
4
9
6
7
1
6
9
3
2
8
3
5
1
2
3
5
1
5
4
4
3
9
1
4
7
Time 00:00
Mistakes 0
Ready
Hard Sudoku #116
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 28 of 81 |
| Technique score | 117.4 |
| Rated techniques | 7 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 3, column 3 already sees all eight other digits in its row, column and box, so it can only be 5.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.