Quidditch Through the Ages to Find Them" have raised £17 million. In 2001, Rowling penned two companion books to the "Harry Potter series", "Quidditch Through the Ages" and "Fantastic Beasts and Where to Find Them", for British charity and offshoot of Live Aid, Comic Relief with all of her royalties going to the charity. As of July 2008, the books combined are estimated to have earned over $30 million for Comic Relief. The two books have since been made available in hardcover. Within the fictional world of "Harry Potter", "Quidditch Through the Ages" is written by Kennilworthy Whisp, a renowned Quidditch expert. In both
Harry Potter and the Chamber of Secrets (video game) are not time-limited and are not related to learning spells. These challenges are all based on events from the book, for example, travelling into the Forbidden Forest and gathering ingredients for a potion Hermione is making. The PlayStation version of the game is a sequel to the "Harry Potter and the Philosopher's Stone" game and was also developed by Argonaut Games. It retains many elements and graphics from its predecessor but with some places in Hogwarts being expanded or moved as well as new mini-games that are played as the storyline progresses. Unlike other versions, most of the new spells