Sudoku No. 81
1
5
3
9
3
6
5
4
9
8
7
5
1
4
6
2
6
3
4
6
7
2
5
8
2
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. 81, moderatePoint Paper, /sudoku/81