PlaySudoku.us
Medium · Puzzle #378
7
4
5
8
3
5
7
6
9
9
1
2
2
4
1
9
7
4
2
8
3
9
2
8
9
8
1
2
6
1
2
3
4
5
7
Nikoli, the Japanese puzzle company that popularized Sudoku, requires all their puzzles to be created by hand — no computers.
Nikoli, the Japanese puzzle company that popularized Sudoku, requires all their puzzles to be created by hand — no computers.
Backtracking — the algorithm most computers use to solve Sudoku — is a form of depth-first search with pruning.
Backtracking — the algorithm most computers use to solve Sudoku — is a form of depth-first search with pruning.