PlaySudoku.us
Expert · Puzzle #288
1
3
8
4
5
2
1
5
7
9
1
2
2
1
9
5
1
3
2
4
3
5
6
7
8
Naked Singles are your fastest technique. Exhaust them completely before moving to more complex methods.
Naked Singles are your fastest technique. Exhaust them completely before moving to more complex methods.
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.