PlaySudoku.us
Hard · Puzzle #420
3
4
6
5
6
7
1
7
1
2
6
5
9
8
9
7
6
8
2
2
9
9
4
1
3
1
8
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.