PlaySudoku.us
Hard · Puzzle #821
9
1
5
3
7
3
6
9
7
4
5
9
2
3
9
3
6
9
6
1
2
5
1
8
3
7
8
"I was taught that the way of progress was neither swift nor easy." — Marie Curie
"I was taught that the way of progress was neither swift nor easy." — Marie Curie
The maximum number of givens in a Sudoku that still leaves the rest logically deducible (no trivial completion) can exceed 77.
The maximum number of givens in a Sudoku that still leaves the rest logically deducible (no trivial completion) can exceed 77.