In Zelda: A Link to the Past, the Cane of Somaria (a recurring item in the Zelda series) could not traditionally be obtained until later in the game in the Misery Maze dungeon. Take a look at this instructional video and learn how to get the Cane Somaria early on with the mirror glitch. This trick does not work on the Super Nintendo console, only on the emulator and the Game Boy Advanced.
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