PlaySudoku.us
Hard · Puzzle #266
8
3
5
9
6
6
2
4
3
9
6
4
8
8
4
7
1
5
4
2
2
4
7
8
1
6
9
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.
Some hospitals use Sudoku as a cognitive exercise for patients recovering from strokes or brain injuries.
Some hospitals use Sudoku as a cognitive exercise for patients recovering from strokes or brain injuries.