PlaySudoku.us
Hard · Puzzle #473
4
3
8
4
9
1
3
2
2
6
8
2
9
1
4
4
9
8
2
6
5
3
1
6
7
8
6
1
9
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.