PlaySudoku.us
Hard · Puzzle #959
4
2
1
2
5
9
8
2
1
5
3
2
3
9
7
1
8
9
6
9
8
7
4
7
3
9
4
"The essence of chess is thinking about what chess is." — David Bronstein
"The essence of chess is thinking about what chess is." — David Bronstein
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.