PlaySudoku.us
Evil · Puzzle #677
6
1
9
3
1
9
7
4
2
5
3
9
7
4
5
1
7
4
1
2
6
8
3
4
Techniques used
- Hidden Single
- Naked Single
- Pointing Pair
- Pointing Triple
- Box-Line Reduction
- Skyscraper
- 2-String Kite
- UR Type 4
- XY-Chain
- Naked Triple
- Naked Pair
- W-Wing