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
The Magical Worlds of Harry Potter it was "cool that their hero, Harry, was encountering some of the creatures of mythology." Colbert felt that knowing the origins of Rowling's character and creatures increased "the books' magic tenfold" and made the "Harry Potter" universe seem more lifelike. Feeling that he wanted to share this with others, Colbert spent a year researching the references in the novels and collected his discoveries for a guidebook to the magical world of Harry Potter. Colbert wrote "The Magical Worlds of Harry Potter" while teaching a seminar on self-publishing to graduate students at the University of North Carolina. He had it self-published