Exit Mice are items in EarthBound. These strange yellow mice with arrows can lead Ness and friends out of dungeons, however only one can be carried at a time, and they cannot be bought or sold. They live in a house on the southern outskirts of Onett, but can be found in the Desert Gold Mine and Stonehenge Base also.
An Exit Mouse's in-game sprite.
In Mother 1+2, Exit Mice cannot be used in the Cave of the Past, but can be used in the strange room just before Giygas, leading to some strange glitches.[1]