PlaySudoku.us
Expert · Puzzle #857
5
3
6
3
7
9
1
2
9
2
8
4
8
3
9
5
3
1
6
9
2
8
3
4
Techniques used
- Naked Single
- Hidden Single
- Naked Pair
- Naked Triple
- Naked Quad
- Box-Line Reduction
- Skyscraper
"The hardest game to win is a won game." — Emanuel Lasker
"The hardest game to win is a won game." — Emanuel Lasker
"It is impossible to be a mathematician without being a poet in soul." — Sofia Kovalevskaya
"It is impossible to be a mathematician without being a poet in soul." — Sofia Kovalevskaya