PlaySudoku.us
Expert · Puzzle #243
8
6
7
1
4
5
3
4
8
6
5
3
2
8
9
1
7
9
3
5
7
8
4
Techniques used
- Naked Single
- Hidden Single
- Naked Pair
- Naked Triple
- Pointing Pair
- XY-Wing
- Skyscraper
"Whatever you are, be a good one." — Abraham Lincoln
"Whatever you are, be a good one." — Abraham Lincoln
The Shannon entropy of a Sudoku puzzle decreases as more cells are filled — a measure of how much uncertainty remains.
The Shannon entropy of a Sudoku puzzle decreases as more cells are filled — a measure of how much uncertainty remains.