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When Edward Nygma, the genius behind the computer game, "Riddle of the Minotaur," demands his rightful share of profits for the game from his greedy and manipulative boss, Mockridge, he is summarily fired. Nygma vows revenge, and years later when Mockridge is selling his company to Wayne Enterprises, Nygma makes his move, in a new guise, that of the Riddler! He kidnaps Mockridge, but not before encountering Batman and Robin. Batman quickly deduces the Riddler's real identity. In order to rid himself of the Dark Knight and "his brat," the Riddler uses Mockridge to lure Batman and Robin into a giant 'Minotaur' maze, based on the computer game. The only way Batman can save Mockridge and leave the maze is by solving a series of deadly riddles.
Batman: I'll find Mockridge if I have to tear this place apart, Nygma!
Batman: (about the Riddler's maze) I don't know what's worse – the traps or the puns.
The Riddler: You have eight minutes, gentlemen, then Mockridge becomes the only good corporate shark – a dead one.
Batman: Mockridge may have his money, but he won't be sleeping well. How much is a good night sleep worth? Now there's a riddle for ya!