SUDOKU
Write a number from 1 to 9 into each empty square in the grid so that every number from 1 to 9 appears exactly once in each horizontal row, each vertical column, and each 3×3 block.
9
5
6
6
3
1
7
1
9
2
9
4
9
4
6
6
2
3
4
9
1
6
2
7
8
* Easy