4
7
9
8
7
5
1
4
8
9
5
1
7
2
4
3
1
7
5
2
5
3
8
9
2
8
Time 00:00
Mistakes 0
Ready
Hard Sudoku #156
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 26 of 81 |
| Technique score | 104.6 |
| Rated techniques | 4 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 4, column 5 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.