PlaySudoku.us
Hard · Puzzle #229
5
4
5
8
6
3
2
7
4
8
3
9
3
6
8
6
4
9
5
3
1
4
2
8
7
3
1
3
6
8
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.
"It is not enough to be a good player; you must also play well." — Siegbert Tarrasch
"It is not enough to be a good player; you must also play well." — Siegbert Tarrasch