PlaySudoku.us
Evil · Puzzle #114
3
8
6
1
5
8
8
1
2
5
4
7
6
4
2
7
7
6
2
1
4
5
2
5
6
1
Techniques used
- Hidden Single
- Naked Single
- Naked Triple
- Naked Pair
- Pointing Pair
- Box-Line Reduction
- Skyscraper
- XY-Wing
- W-Wing
The minimum number of clues (17) needed for a unique Sudoku was proved by exhaustive computer search in 2012.
The minimum number of clues (17) needed for a unique Sudoku was proved by exhaustive computer search in 2012.
"Mathematics is the music of reason." — James Joseph Sylvester
"Mathematics is the music of reason." — James Joseph Sylvester