(You Luigi) wins a mansion in a contest he doesn't enter. He invites Mario to celebrate with him, but Mario is mysteriously missing by the time You arrives. You looks around the foyer until a strange orange glow around a floating key catches your attention. The glow quickly vanishes, and You use the key it dropped to access the Parlor. There, You meet Professor E. Gadd battling a Yellow Ghost with the Poltergust 3000. It breaks free, and, after that he gives you the poltergust