PlaySudoku.us
Medium · Puzzle #169
8
1
7
5
9
9
2
1
5
4
6
5
6
7
1
8
6
8
2
7
1
9
4
9
1
2
5
8
1
3
2
7
7
9
6
1
8
Network flow algorithms can solve special classes of Sudoku more efficiently than general backtracking.
Network flow algorithms can solve special classes of Sudoku more efficiently than general backtracking.
Retired people who solve puzzles daily have been shown in multiple studies to score higher on memory tests than non-puzzlers of the same age.
Retired people who solve puzzles daily have been shown in multiple studies to score higher on memory tests than non-puzzlers of the same age.