PlaySudoku.us
Medium · Puzzle #840
4
9
8
7
5
3
1
5
8
5
8
7
4
6
3
1
9
5
8
2
4
4
3
1
5
3
8
4
7
9
5
1
2
6
3
Solving Sudoku is NP-complete for an n×n grid. For the standard 9×9, it's fast — but for larger grids, it becomes exponentially harder.
Solving Sudoku is NP-complete for an n×n grid. For the standard 9×9, it's fast — but for larger grids, it becomes exponentially harder.
Solving Sudoku is NP-complete for an n×n grid. For the standard 9×9, it's fast — but for larger grids, it becomes exponentially harder.
Solving Sudoku is NP-complete for an n×n grid. For the standard 9×9, it's fast — but for larger grids, it becomes exponentially harder.