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