4
1
5
3
6
9
8
7
5
4
3
2
6
6
5
7
5
2
4
1
9
7
8
Time 00:00
Mistakes 0
Ready
Hard Sudoku #206
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 23 of 81 |
| Technique score | 150.5 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 3, column 5 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.