PlaySudoku.us
Evil · Puzzle #155
2
8
4
9
2
8
6
7
4
1
3
4
1
9
3
5
7
7
6
5
9
5
7
6
8
4
Techniques used
- Naked Single
- Hidden Single
- Naked Triple
- Pointing Pair
- 2-String Kite
- Forcing Chains
- Box-Line Reduction
- XY-Chain
- X-Wing
"Mathematics is the only place where truth and beauty mean the same thing." — Danica McKellar
"Mathematics is the only place where truth and beauty mean the same thing." — Danica McKellar
The minimum number of clues needed to create a valid Sudoku with a unique solution is 17.
The minimum number of clues needed to create a valid Sudoku with a unique solution is 17.