1
9
3
2
5
6
6
9
2
5
8
6
7
5
3
1
3
8
2
3
8
1
1
4
5
3
6
8
6
2
7
1
2
9
5
The world record for solving an easy Sudoku is under 1.4 seconds, set in competitive speed-solving.
The world record for solving an easy Sudoku is under 1.4 seconds, set in competitive speed-solving.
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.