PlaySudoku.us
Evil · Puzzle #858
6
2
8
1
9
5
3
4
2
1
2
3
6
6
5
7
9
4
2
3
1
5
8
7
6
Techniques used
- Naked Single
- Hidden Single
- Forcing Chains
- Box-Line Reduction
- Pointing Pair
"In mathematics, the art of proposing a question must be held of higher value than solving it." — Georg Cantor
"In mathematics, the art of proposing a question must be held of higher value than solving it." — Georg Cantor
The hardest published Sudoku puzzle — graded by the number of search nodes a computer needs — was named 'Al Escargot' by its creator.
The hardest published Sudoku puzzle — graded by the number of search nodes a computer needs — was named 'Al Escargot' by its creator.