Fictional universe of Harry Potter Harry, serves as the commentator for the Quidditch matches at Hogwarts until he graduates. The sport appears in every book except the seventh; school matches are canceled in the fourth due to the need to use the pitch for the Triwizard Tournament, but Harry attends the Quidditch World Cup as a guest of the Weasley family. Other wizard games and sports include Gobstones (a version of marbles in which the stones squirt foul-smelling liquid into the other player's face when they lose a point), Exploding Snap (a card game in which the cards explode), and Wizard Chess (in which the
Legal disputes over the Harry Potter series An Unauthorized Guide to Harry Potter Fiction". In November 2007, "The Scotsman" reported that Rowling had threatened legal action against American computer programmer G. Norman Lippert for allegedly violating her intellectual property rights by producing and publishing the online novel, "James Potter and the Hall of Elders' Crossing", an unofficial and unauthorised continuation of the "Harry Potter" series. Written as a fan fiction project for Lippert's wife and sons, the novel is set eighteen years after the end of the last official installment in the series, "Harry Potter and the Deathly Hallows", and describes the adventures of Harry Potter's son,