PlaySudoku.us
Easy · Puzzle #221
6
2
6
7
1
2
5
8
5
7
9
1
6
6
1
3
7
4
4
1
8
9
5
3
2
5
9
4
7
2
6
1
9
1
2
6
7
4
5
8
4
8
2
9
6
9
1
7
"A champion is afraid of losing. Everyone else is afraid of winning." — Billie Jean King
"A champion is afraid of losing. Everyone else is afraid of winning." — Billie Jean King
Solving Sudoku is NP-complete for an n×n grid. For the standard 9×9, it's fast — but larger grids become exponentially harder.
Solving Sudoku is NP-complete for an n×n grid. For the standard 9×9, it's fast — but larger grids become exponentially harder.