Luigi's Mansion: Dark Moon is a 2013 action-adventure game developed by Next Level Games and published by Nintendo for the Nintendo 3DS. It is the second installment in the Luigi's Mansion series, following Luigi's Mansion (2001). The story follows Luigi as he explores Evershade Valley, capturing ghosts using a specialized vacuum cleaner invented by Professor E. Gadd. In order to restore peace to Evershade Valley, Luigi must collect the pieces of the Dark Moon and recapture the main antagonist, King Boo.