1
5
6
9
4
7
5
9
1
8
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4
4
7
1
8
8
6
1
5
2
4
4
2
3
8
9
6
Time 00:00
Mistakes 0
Ready
Hard Sudoku #197
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 28 of 81 |
| Technique score | 119.1 |
| Rated techniques | 6 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 2, column 5 already sees all eight other digits in its row, column and box, so it can only be 4.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.