Harry Potter Trading Card Game these expansions include the addition of the "Quidditch" lesson type and "Match" cards introduced in the "Quidditch Cup" expansion, location cards introduced in the "Diagon Alley" expansion, and a larger pool of adventure cards in the "Adventures at Hogwarts" expansion. The fourth and final expansion released was "Chamber of Secrets", which has 140 cards plus 55 Foil or Hologram Portrait Premium rares (October 2002). This last expansion features cards based on the "Chamber of Secrets" book, where all previous cards were based on the "Sorcerer's Stone" book. From its conception in 2001 through 2003, the "Harry Potter Trading Card Game"
The Magical Worlds of Harry Potter released in bookstores. When his nephew and nieces received the book, they read it for the remainder of their vacation with him. Colbert, a historian and former head writer on the television quiz show "Who Wants to Be a Millionaire?", became interested in the books and bought the first novel in the series, "Harry Potter and the Philosopher's Stone", to see what the story was about. As he was reading, he began to notice mythological references in the book. He commented: "I almost laughed out loud when I came across the three-headed dog <nowiki>[</nowiki>Fluffy<nowiki>]</nowiki>. I instantly knew it was a