PlaySudoku.us
Expert · Puzzle #938
4
7
2
9
5
2
1
6
3
5
8
9
5
1
4
3
8
3
6
3
4
5
9
8
4
Techniques used
- Naked Single
- Hidden Single
- Box-Line Reduction
- X-Wing
- Skyscraper
- XY-Wing
- XY-Chain
"The mind is not a vessel to be filled, but a fire to be kindled." — Plutarch
"The mind is not a vessel to be filled, but a fire to be kindled." — Plutarch
Some Sudoku apps use neural networks to grade puzzle difficulty — training on millions of human solve attempts.
Some Sudoku apps use neural networks to grade puzzle difficulty — training on millions of human solve attempts.