PlaySudoku.us
Hard · Puzzle #402
7
5
1
6
4
9
7
3
9
1
9
3
5
4
7
2
9
1
1
8
5
6
6
3
7
4
8
2
6
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.
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.