PlaySudoku.us
Hard · Puzzle #671
6
3
4
7
5
7
4
2
5
9
7
3
6
5
9
3
2
4
4
7
6
2
5
4
5
8
1
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.