PlaySudoku.us
Evil · Puzzle #514
4
1
6
8
3
1
7
9
2
8
6
5
3
8
4
1
9
2
6
7
6
8
3
2
5
Techniques used
- Hidden Single
- Naked Triple
- Pointing Triple
- Pointing Pair
- Naked Pair
- Box-Line Reduction
- XY-Wing
- W-Wing
- Finned X-Wing
- XY-Chain
- Forcing Chains
- Naked Single
- Naked Quad