From the game Mario and Luigi Superstar Saga for the Game Boy Advance

Just as you hit the boundary of an area, press select. The map will be brought up. You will stay in the same position, but because you hit the boundary, you will be in the next room. You can get to all sorts of weird places and sometimes surpass previously unavailable areas. This only works with earlier versions of the game.

Submitted by: kornyhatemachine

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