Cheese

Cheese is an object featured in certain rooms in Luigi's Mansion. It resembles Swiss cheese in particular, as it a triangular prism consisting of several holes. Cheese is only visible while Luigi uses the Game Boy Horror display, and if he scans it with the Game Boy Horror, a Gold Mouse emerges from the Cheese. This only occurs once, so if either Luigi has caught the Gold Mouse or it has fled, scanning the Cheese does not cause another Gold Mouse to appear. Cheese only appears while a room is dark, so once the room lights up, the Cheese disappears.

Cheese only appears in five rooms. It first appears in the Study, which also has a book called Darkness is Their Cheese. The book discusses the effect that Cheese has on mice within the dark, and suggests that it causes them to become gold.

Unlike Speedy Spirits, a Cheese reappears in its respective rooms during the blackout; a Gold Mouse can still appear from the Cheese, even if it had not been scanned prior to the blackout.