In Luigi's Mansion, Professor E. Gadd (derived from the interjection "Egad!" which may be exclaimed when a person has just been frightened) arms Luigi with two of his inventions: the Poltergust 3000 (a parody of the Proton pack) and the Game Boy Horror. The Poltergust 3000 is a high-powered vacuum cleaner designed for capturing ghosts (à la Ghostbusters) and to gather treasure. To capture ghosts, the player must first shine Luigi's flashlight at them and stun them. This makes them show their heart, and gives Luigi a chance to suck them up into the Poltergust 3000, steadily reducing the ghosts' hit points to zero, at which point they can be captured. The ghosts remain in the Poltergust 3000, although certain more advanced ghosts, named "Portrait Ghosts", are extracted and put back into their portraits after a process at the end of the game's four areas. When these paintings are made, they are stored in the gallery in Professor E. Gadd's laboratory.Later in the game, Luigi locates three medallions which allow him to expel fire, water, or ice from the Poltergust 3000. These elements are needed to capture certain ghosts.