Yen Sid's Magic Mirror is the device Mickey used to gain access to his study. It seems that the mirror has a mind of his own, and deliberately sent Mickey there, if going by Yen Sid's words from the beginning of the game.

By the end of the first Epic Mickey game, Yen Sid closes it. As such, when the Mad Doctor returns in Epic Mickey 2: The Power of Two, Gus is forced to build a high-tech Television in order to allow Mickey to travel first to Yen Sid's castle and then back to Wasteland.

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