PlaySudoku.us
Evil · Puzzle #157
2
5
6
4
3
3
5
7
1
4
3
2
6
4
6
1
9
6
1
2
5
3
2
8
4
Techniques used
- Hidden Single
- Naked Single
- Pointing Pair
- XY-Wing
- Skyscraper
- 2-String Kite
- Naked Quad
- Naked Pair
- Box-Line Reduction
- W-Wing
- Swordfish
- Simple Coloring
- Forcing Chains