PlaySudoku.us
Medium · Puzzle #679
1
3
7
5
9
1
3
7
8
1
5
6
6
9
3
1
1
4
8
6
5
7
6
9
7
2
3
6
5
4
8
7
1
3
1
6
9
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.