PlaySudoku.us
Evil · Puzzle #682
5
3
4
6
3
8
5
9
5
6
8
5
2
6
2
1
6
7
4
3
9
8
2
7
2
6
1
Techniques used
- Naked Single
- Hidden Single
- Naked Pair
- Pointing Triple
- UR Type 1
- Forcing Chains
- Skyscraper
Some hospitals use Sudoku as a cognitive exercise for patients recovering from strokes or brain injuries.
Some hospitals use Sudoku as a cognitive exercise for patients recovering from strokes or brain injuries.
Irregular Sudoku (also called Squiggly Sudoku) uses non-rectangular regions instead of 3×3 boxes, requiring different solving strategies.
Irregular Sudoku (also called Squiggly Sudoku) uses non-rectangular regions instead of 3×3 boxes, requiring different solving strategies.