PlaySudoku.us
Hard · Puzzle #193
7
2
9
3
1
3
2
6
7
4
9
6
1
9
2
8
4
7
9
7
5
8
6
3
6
5
1
"The measure of intelligence is the ability to change." — Albert Einstein
"The measure of intelligence is the ability to change." — Albert Einstein
Counting the number of Sudoku solutions for a given puzzle is #P-complete — computationally harder than NP-complete.
Counting the number of Sudoku solutions for a given puzzle is #P-complete — computationally harder than NP-complete.