Sudoku No. 66
9
5
6
7
8
2
4
7
7
1
4
8
9
4
2
5
5
5
4
3
1
2
9
3
2
6
9
7
3
1
2
3
6
Fill every empty square with a digit from 1 to 9.
Each row, each column and each of the nine 3×3 boxes contains every digit exactly once.
The printed digits are fixed. Every puzzle has one solution and never needs a guess.
Sudoku No. 66, gentlePoint Paper, /sudoku/66