A free program for Android, by Bart Bonte.

Blocky XMAS is a fun and festive puzzle game you can play on your smartphone or tablet. It features Christmas-themed blocky puzzles to get you into the holiday spirit. There are 40 challenging levels waiting for you that will surely keep you busy and entertained for a long time.

How to play: 

The gameplay is simple and easy to learn. Your goal is to use the magnetic star block to move and arrange all the Christmas tree blocks into their designated positions. When you swipe on the screen, the star block moves and attracts all the other blocks toward it. Use this magnetic attraction to your advantage and strategize your moves.