PlaySudoku.us
Hard · Puzzle #165
1
3
5
8
4
9
1
6
7
4
2
1
2
3
8
5
7
4
3
2
6
2
5
7
1
9
4
7
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.
"Eureka!" — Archimedes (upon discovering the principle of water displacement)
"Eureka!" — Archimedes (upon discovering the principle of water displacement)