The Mouse is a passive monster that is found underground, unlike others which are always found in the overworld. It does nothing except for running around and standing still once in a while, like other passive monsters, but unlike them they can't be damaged or killed by hostile enemies. It also doesn't drop a monster banner, unlike other passive monsters. It is one of the smallest monsters in the game, just slightly longer than a Bee.
- Given a larger, more detailed sprite.
- Can be captured with a Bug Net.
- Added to the game.