 In "Luigi's Mansion", the main story is played out over four stages, with players able to also access a training room and a gallery at the Professor E. Gadd's laboratory between stages.In each stage, players control Luigi as he explores the mansion's rooms and hunts down the ghosts that lie within them, acquiring keys to get through locked doors and eventually dealing with a boss ghost hidden at the end of the stage, with more rooms becoming accessible as each stage is completed.To assist him in his task, Luigi uses a flashlight and two inventions supplied by E. Gadd – the Poltergust 3000, a specially modified, high powered vacuum cleaner; and the Game Boy Horror, a play on Nintendo's Game Boy Color.