PlaySudoku.us
Hard · Puzzle #321
7
7
2
8
1
4
6
8
5
4
3
1
5
7
8
9
7
1
3
8
8
7
1
2
3
4
6
1
7
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.