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) August 2006, it was the 18th highest-selling game launched for the Game Boy Advance, Nintendo DS or PlayStation Portable in that country. By July 2006, the PlayStation 2 version of "Chamber of Secrets" had sold 700,000 copies and earned $28 million in the United States. "Next Generation" ranked it as the 89th highest-selling game launched for the PlayStation 2, Xbox or GameCube between January 2000 and July 2006 in that country. Combined console sales of the "Harry Potter" line reached 3 million units in the United States by July 2006. The PlayStation 2 version also received a "Platinum" sales award