PlaySudoku.us
Evil · Puzzle #235
9
5
5
3
4
1
7
2
3
2
6
7
3
2
1
6
4
3
6
4
1
5
9
2
Techniques used
- Hidden Single
- Naked Single
- Naked Triple
- Pointing Pair
- XY-Wing
- 2-String Kite
- UR Type 4
- Forcing Chains
- X-Wing
- XY-Chain
"Simplicity is the ultimate sophistication." — Leonardo da Vinci
"Simplicity is the ultimate sophistication." — Leonardo da Vinci
Counting the number of Sudoku solutions for a given puzzle is #P-complete — computationally harder than NP-complete.
Counting the number of Sudoku solutions for a given puzzle is #P-complete — computationally harder than NP-complete.