Game Boy Horror

The Game Boy Horror is a machine designed by Professor E. Gadd in Luigi's Mansion. It allows Professor E. Gadd to communicate with Luigi. It also has a map, Luigi's stats, the Painting Ghost's descriptions, and a radar for Boos. Luigi can look in the Game Boy Horror's camera screen to allow the player to see the mansion in the first person perspective. The player can also select objects and have Luigi say something about it, much like Goombario and Goombella's ability in the Paper Mario series.

The Game Boy Horror was going to be an item in Mario & Luigi: Superstar Saga, but was replaced with the updated Game Boy Horror SP. Also Prof. E. Gadd occasionally contacts the Starbeans Café using a giant two-way Game Boy Horror that is capable of warping items between the two locations.