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I didn't watch the video, but I'd probably pick that book too. There's 3 specific tasks for the tournament, the dragon egg challenge (sounds like a good multiball opportunity), the underwater rescue (sounds like a hurry up mode), and the maze with traps (shoot the flashing ramps in a certain order?), and then that'd lead to a wizard mode (pun very much intended) that has you battling Voldemort. None of the other books have so distinct a set of events that would work for pinball. Of course if I were making an HP pin, it'd be all quiditch all the time.