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