4
7
6
5
7
4
2
6
1
2
5
4
8
7
9
3
2
7
8
3
6
6
1
8
2
2
9
4
1
Time 00:00
Mistakes 0
Ready
Hard Sudoku #70
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 29 of 81 |
| Technique score | 97.1 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 7, column 4 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.