The Opera House glitch occurs in the Japanese Super Famicom version of Final Fantasy VI. It involves leaving one of the rats on the Opera House catwalks alive until the World of Ruin. Upon being defeated by it, the player will be whisked away to the World of Balance instead of the World of Ruin. This is a harmful glitch as the player cannot return to the World of Ruin, and is thus unable to complete the game.

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