PlaySudoku.us
Hard · Puzzle #635
3
1
9
2
9
4
3
7
2
8
7
8
6
5
4
4
2
1
4
5
6
9
2
2
1
6
8
7
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.