Use the arrow keys to make Luigi walk. Use the SpaceBar to use your Poltergust, and use the mouse to aim it. Everything else seems self-explanatory, yeah.
THIS ISN'T A JOKE. Also,with a creepypasta part in the intro: the boo.exe part... And there is no way back cuz there's a wall where the door should be. Thanks to scratchu8 ( scratch.mit.edu/users/scratchU8 ) for the og project. And that's Luigi's Mansion For U! Rapo out!