Rainbow Road

Rainbow Road is a secret level in Super Mario 64. It can be found through personalized copies or ROMS of the games, or through the March 5th 1996 build.

Discovery
A user on the discord claiming to be FANDOM user DannyShellstar playing the March 5th 1996 build found a secret level in Super Mario 64 resembling Rainbow Road. He claims to have found a painting in the basement.

Reportings
Everything reported here should be taken with skepticism, as these reportings are unverified.

Report #1
(Note - this is from the user claiming to be DannyShellstar.)

''I found Rainbow Road in a painting I saw in the basement. The HUD just completely dissapeared once I entered. After that, I saw Koopa the Quick, and he said "Hey Mario! This place is a PERFECT spot to race on! So, do you think you could race me in my domain?"''

''I hit yes and started the race. I went all around the track, and where there wasn't a flag before I went down the hill, now there was.''

''After a while, Koopa finally showed up. He said "Phew! You.. .really are the fastest one of all! You just looked like a blur! Here you go, you won this fair and square!"''

''Then a star spawned. I grabbed it, then went up to the top floor, where I saw Robo-Mario again, but I beat him up without any problems.''

Ties to Robo-Mario
The person claiming to be DannyShellstar said he found Robo-Mario after beating Koopa the Quick in Rainbow Road, even though he had 58 stars. This could mean that Robo-Mario could be a punishment to players if they knew too much about the Personalisation A.I.