PlaySudoku.us
Hard · Puzzle #437
6
4
2
8
7
5
4
9
6
4
7
1
9
2
4
1
5
9
2
6
5
8
4
3
8
1
9
4
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.
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.