9
6
3
1
8
1
5
2
4
6
5
7
9
7
8
1
3
3
2
5
6
8
6
3
3
2
5
9
8
6
5
2
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.