PlaySudoku.us
Expert · Puzzle #421
7
3
1
8
6
8
7
2
9
3
1
1
5
6
4
2
8
3
3
2
7
4
9
8
6
The minimum number of clues needed to create a valid Sudoku with a unique solution is 17.
The minimum number of clues needed to create a valid Sudoku with a unique solution is 17.
The minimum number of clues needed to create a valid Sudoku with a unique solution is 17.
The minimum number of clues needed to create a valid Sudoku with a unique solution is 17.