SUDOKU

The objective is to fill a 9×9 grid so that each column, each row, and each of the nine 3×3 boxes (also called blocks or regions) contains the digits from 1 to 9 only one time each. The puzzle setter provides a partially completed grid.

4 2 9
3 5 7
7 4 6 3
1 8 2 9
8 9 4 6
1 5
8
4 3 7 2