This was a test of the Ultra 64's (Then known as Project Reality) Mario Engine.
(NOTE: This is a mock-up, not real footage of an early build of the game. None of this footage should be used when researching SM64 development history.)
Rom by iProgramInCpp: https://www.youtube.com/channel/UCzAh1i1D8Vqpu_O0wfDJ7Ew
VHS tape Transferred by Soulcatcher: https://www.youtube.com/channel/UCV_Hzipt38f7nDxfsAfeUJg
My Discord: https://discord.gg/vTdgcFkyTA