PlaySudoku.us
Evil · Puzzle #821
9
5
2
7
1
8
2
8
7
3
6
3
6
5
4
6
2
7
2
1
3
3
9
Sudoku is a constraint satisfaction problem — the same class of problems used in scheduling, circuit design, and AI planning.
Sudoku is a constraint satisfaction problem — the same class of problems used in scheduling, circuit design, and AI planning.
Before using pencil marks, see how far you can get on a hard puzzle with pure mental tracking.
Before using pencil marks, see how far you can get on a hard puzzle with pure mental tracking.