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