Rainbow Road only had one star, and that one consisted of racing Koopa the Quick through Rainbow Road, a la Mario Kart. Later, while playing the build again on a new save file, he found Rainbow Road, an unused level that could still appear in the final build thanks to the A.I.
Robo-Mario also allegedly could attack Toads. The boss consisted of dodging attacks that Mario himself could do, and slide kicking Robo-Mario while its back was turned. FANDOM user DannyShellstar reportedly received the build's ROM from an anonymous user on Skype, where he played it for a while, and came across Robo-Mario, a boss removed from Mario 64, but could still appear in the final game thanks to the Personalization A.I.