Princess Daisy invites Luigi over for their date at a bustling huge theme park, Wispee's World. But when they arrive the fun had disappeared when it became haunted and abandoned. Mario and Peach were also supposed to arrive, but they've vanished somewhere in the park. Luigi is very reluctant to be doing his job rescuing Mario in haunted places again while Daisy finds it more thrilling to be running around hunting ghosts while being by Luigi's side all the way. Both make a perfect co-op team sucking up ghosts and solving puzzles in the massive theme park world full of roller coasters, dark rides, virtual rides, ferris wheels, and the secret dark castle of the eccentric wizard Wispee, who is secretly a scary witch named Weary, girlfriend of King Boo.
