u/backofthebill

Plot: Queen Boo, after years of doing her own thing learns of King Boo's downfall seeks revenge on Luigi and his friends. She captures all but Luigi and Egad, putting Luigi's friends and brother into a deep sleep tormented by nightmare. Each one put in a different haunted building which is all located in a haunted town. Luigi must go to each location, reach his friend, and go inside their nightmare to defeat the boss, freeing them from their internal nightmare. At some point near the end of the game Luigi gets trapped in a nightmare and Mario must free him. Afterwards they team up to defeat Queen Boo and maybe King Boo at the same time.

Side note: I don't know what the new gameplay gimmick would be but it be cool to have multiple sub weapons to help catch ghost.