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