PlaySudoku.us
Easy · Puzzle #470
6
4
7
8
2
5
7
1
3
4
1
4
8
2
5
6
9
6
3
1
2
5
8
3
4
5
6
1
7
1
5
2
6
3
4
8
9
5
6
2
7
3
7
4
3
5
2
5
4
9
"Young man, in mathematics you don't understand things. You just get used to them." — John von Neumann
"Young man, in mathematics you don't understand things. You just get used to them." — John von Neumann
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.