PlaySudoku.us
Hard · Puzzle #623
9
6
4
3
2
5
2
1
9
1
3
8
3
4
5
7
1
6
3
2
3
4
7
9
5
6
"We are all connected; To each other, biologically. To the earth, chemically. To the rest of the universe atomically." — Neil deGrasse Tyson
"We are all connected; To each other, biologically. To the earth, chemically. To the rest of the universe atomically." — Neil deGrasse Tyson
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.