So, we got one information left. Yes, there was supposed to be a Luigi. So, it was multiplayer but that's the only thing that people knew about it and so did I. But Luigi later appeared in Super Mario 64 DS. We can prove that the ideas in Super Mario 64 DS was stolen from Super Mario 64 2 and also, Boos laugh is just Bowser's laugh sped up. In 1998, Mario 64 had an answer to it, which was originally claimed by Rare - the answer was actually Banjo Kazooie - BEARS! And also, while the critics were playing, you get to play multiplayer and also you get to see the credits while Peach was graduating Mario.
Here's an image - BEARS!
Here's an image of the Mario 64 cartridge: