PlaySudoku.us
Evil · Puzzle #489
4
7
9
5
2
8
7
1
6
4
7
3
9
2
3
5
8
1
9
6
8
7
4
A valid Sudoku puzzle has exactly one solution. If it has two or more, it's considered broken.
A valid Sudoku puzzle has exactly one solution. If it has two or more, it's considered broken.
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.