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.
6
9
4
5
8
6
1
3
8
3
6
2
4
1
5
7
2
8
7
4
5
8
2
3
* Easy