PlaySudoku.us
Medium · Puzzle #87
5
6
8
7
5
4
3
9
8
7
5
4
1
2
9
6
6
8
1
3
5
2
7
3
1
8
2
4
6
6
4
3
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.
When stuck, try looking at the puzzle from each digit's perspective rather than each cell's perspective.
When stuck, try looking at the puzzle from each digit's perspective rather than each cell's perspective.