<p>Luigi embarks on a dream vacation with Mario and friends upon receiving an invitation to a luxurious hotel. However, his dream quickly becomes a nightmare when King Boo reveals everything had been a ploy to capture Mario and friends. With the assistance of Professor E. Gadd once again, the reluctant and cowardly hero Luigi traverses up and down treacherous floors of the now-ominous hotel on a quest to save them. Wield the upgraded Poltergust G-00 to slam and blow away the ghosts' defenses or summon Gooigi, an all-green doppelganger that can help Luigi overcome obstacles he can't get past alone. Interchange between Luigi and Gooigi as one player or grab a friend and control one each. For more frenetic multiplayer action, race the timer to clear various objectives on a series of floors in ScareScraper Mode. ScareScraper Mode can be played online or locally with up to eight players.<br/></p>