PlaySudoku.us
Hard · Puzzle #843
4
2
2
9
4
3
8
7
6
4
5
6
7
8
5
4
2
1
7
2
9
8
5
8
3
7
"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.