8
6
3
8
7
7
5
8
2
9
1
3
4
4
6
1
2
4
5
8
8
2
6
6
9
Time 00:00
Mistakes 0
Ready
Hard Sudoku #50
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 25 of 81 |
| Technique score | 103 |
| Rated techniques | 4 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 4, column 2 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.