Starting today, players logging into the game will find a themed tree in each of their respective houses: red for Gryffindor, green for Slytherin, blue for Ravenclaw, and Yellow for Hufflepuff. Players can then help add to the decorations by voting on their favorite tree ornament via the Harry Potter: Hogwarts Mystery Facebook, Twitter, and Instagram accounts before December 12.

On December 13, the winning ornament will be announced and appear on each of the House Christmas trees. But that’s not all. A video demonstrating how to make a real world version of the ornament will also be posted for wizards and Muggles alike. The video will also highlight Hogwarts’ holiday decor, and tease a time-limited sidequest featuring the Weasleys.