PlaySudoku.us
Hard · Puzzle #572
1
7
4
5
9
2
1
3
3
8
9
4
2
8
7
7
3
6
9
6
2
3
8
4
1
2
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.