 Utilizing the Game Boy Horror, players can access a map of the mansion, seeing which rooms they have visited, what doors are open, and which remain locked.When Luigi finds a key during his explorations, the Game Boy Horror automatically indicates which door it unlocks.In addition to a map function, the device also keeps track of any treasure that Luigi has found – rooms will usually have treasure hidden within, which can be either coins, gems, gold bars and so forth, hidden within items and even in a chest that appears when the ghosts are cleared out, which Luigi can draw out and suck up with the Poltergust; if a ghost harms Luigi, he will drop a small portion of collected treasure that he will need to recover before it disappears.