PlaySudoku.us
Expert · Puzzle #544
5
2
7
1
3
5
9
7
3
6
2
7
2
5
3
9
4
4
2
3
8
9
9
4
2
8
7
Techniques used
- Naked Single
- Hidden Single
- Naked Pair
- Pointing Pair
- Box-Line Reduction
- XY-Wing
- Swordfish
- Skyscraper
"The blunders are all there on the board, waiting to be made." — Savielly Tartakower
"The blunders are all there on the board, waiting to be made." — Savielly Tartakower
A valid Sudoku puzzle has exactly one solution. If it has two or more, it's considered broken.
A valid Sudoku puzzle has exactly one solution. If it has two or more, it's considered broken.