PlaySudoku.us
Evil · Puzzle #819
1
6
7
5
8
2
3
5
2
9
4
6
9
2
8
1
6
8
2
3
6
2
4
7
5
Techniques used
- Hidden Single
- Naked Quad
- Pointing Pair
- Forcing Chains
- Naked Single
- XY-Wing
- Skyscraper
- X-Wing
- Box-Line Reduction
- W-Wing
- Naked Pair
- 2-String Kite
- XY-Chain