Mouse

Mice are ambient enemies found in Luigi's Mansion: Dark Moon and Luigi's Mansion 3. 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. Later, a mouse in the second mansion will hold one of the 13 emeralds in the seedling laboratory.

Mice and Gold Mice reappear in Luigi's Mansion 3 as enemies, acting as they did in Luigi's Mansion: Dark Moon. After defeating Chef Soulfflé, several mice steal the elevator button released from him, prompting Luigi to chase them around the Mezzanine to retrieve the button.