I seem to have a lot of dreams where I'm playing alternate world versions of Video Games
This instance involved Super Mario 64, even though I haven't played it a long time.
I don't remember what happened exactly prior to the SM64 bit, (something to do with repairing a severed space station) but after I transitioned from that, I found myself (Mario) in a Rainbow Ride type course, where I landed on a sole giant cube made of the game's red grating, with a small hole leading to a maze inside the cube. After I navigated the maze, I found myself outside the cube again, but this time Mario had become much larger, and a star above the cube could now be reached. I easily jumped up to grab the star and Mario returned to his normal size instantly and started to do his 'Star Get' dance while falling through the air. As the game did the star shaped Iris Out, Mario had landed on yet another star (which was transparent for some reason as if I already collected it) which happened to be right below him. Before he could finish posing again for collecting another star, the Iris Out had finished, and Mario was thrown into an unrecognizable area inside the castle. He pulled off his Cap and scratched his head like he usually does when he gets out of a painting, but the text that describes what star he got and how many coins he collected didn't appear. Then this message appeared:
"Great!
Please buy this game!
OR WE WILL KILL YOU."
After I read the message, I had immediately turned the system off and started freaking out, to which I shortly found myself awake.