Mouse

Mice are ambient enemies found in Luigi's Mansion: Dark Moon. They flee when Luigi shines the light on him, but they do five HP damage to Luigi if stepped on. Mice are usually found near mouse-holes, where they are generated. They are defeated when Luigi either uses the Poltergust 5000 to suck them in or by shining a Strobulb on them. When a Strobulb is shined on them, they can drop a coin, a heart, or nothing. Gold Mice are rarer than regular mice and disappear after an amount of time. When the Strobulb is used on them, they drop a gold bar.

One mouse plays a role at the beginning of the game. When Luigi first visits the Gloomy Manor, he is unable to open the door since it is locked. A mouse scurries out of the mousehole, holding a key in its tail. Only after Luigi retrieves the key is he able to access the Gloomy Manor.