PlaySudoku.us
Hard · Puzzle #257
2
9
6
7
3
2
1
5
7
5
4
1
9
6
8
8
9
3
9
3
1
5
2
7
9
1
"The science of mathematics presents the most brilliant example of how pure reason may successfully enlarge its domain without the aid of experience." — Immanuel Kant
"The science of mathematics presents the most brilliant example of how pure reason may successfully enlarge its domain without the aid of experience." — Immanuel Kant
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.