Sudoku Christmas

This is a classic sudoku game. You can select any one of three grids(4×4, 6×6 or 9×9) and can set difficulty level. The objective is to fill a selected grid with Christmas items so that each column, each row, and each of the respective sub grids that compose the grid contain all of the items without repeating anyone.
Tap the tile and than tap the block in the left panel