Behind the facade of this multistory headquarters are famous rooms where Harry Potter™ fans can enjoy endless adventures. A classic cast of characters from the Harry Potter™ movies. Use Polyjuice Potion™ to change how the 3 friends look. A daring mission and a close escape from the Dementor™. The LEGO® Building Instructions app lets kids view, zoom and rotate the model as they assemble this impressive set. This toy is magically modular, so children can reposition the different sections within the set for even more adventures.