"To make a two-hour film into a 12 - 15 hour gaming experience, the developers looked at every opportunity in the story to create gameplay, and consulted with author JK Rowling to develop what they call 'lateral fiction'. For instance, in the book and film, Harry submerges the egg that he collected from the first Triwizard event in the prefects' bathroom to listen to a mermaid's song and learn the nature of the second event. It's a short scene in the film, but in the game's fifth level, it turns into a half-hour-long search for the egg within the school's pipes and boiler rooms after Harry loses his grip."