PlaySudoku.us
Evil · Puzzle #914
1
2
3
6
3
4
7
5
2
4
9
3
1
4
5
7
9
9
6
3
7
9
8
6
Techniques used
- Hidden Single
- Naked Single
- Naked Quad
- Pointing Pair
- Pointing Triple
- Box-Line Reduction
- W-Wing
- XY-Chain
- Forcing Chains
"On the chessboard, lies and hypocrisy do not survive long." — Emanuel Lasker
"On the chessboard, lies and hypocrisy do not survive long." — Emanuel Lasker
Set theory provides the formal foundation for Sudoku's rules: each digit must appear exactly once per set.
Set theory provides the formal foundation for Sudoku's rules: each digit must appear exactly once per set.