3
7
4
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4
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3
6
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9
3
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2
9
4
8
5
7
9
9
6
1
2
Time 00:00
Mistakes 0
Ready
Expert Sudoku #153
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 28 of 81 |
| Technique score | 69 |
| Rated techniques | 4 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 8, column 1 already sees all eight other digits in its row, column and box, so it can only be 1.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.