Yoshi Racing

Yoshi Racing is an unreleased racing game similar to Mario Kart 64 by Nintendo and Argonaut. The game supposedly was reinvented into Croc. There is a rumour that Shigeru Miyamoto stole assets from Yoshi Racing when the game was in an early state and reused them in Super Mario 64. Not much is known about Yoshi Racing, nor has there been any claims of a prototype cartridge.

The game would feature Yoshi as the main character. The environments which were used in levels from the game were supposedly used in Super Mario 64. Jez San, the founder of Argonaut, claimed Super Mario 64 'had the same look and feel' of the Yoshi Racing prototype. A worker from Argonaut even claimed that in an incredibly early version of the game, a test level used the infamous skybox of Wet Dry World.

In the 2020 Nintendo Gigaleak, Yoshi's early model was found supposedly created by Argonaut; the model could have once been used in Yoshi Racing.

Reportings
''Everything in this section should be taken with a grain of salt. These are all unverified claims.''

Wet-Dry World Skybox
''Ok so I heard about how some people think Nintendo had stolen the idea for Super Mario 64 from an unreleased Argonaut game called Yoshi Racing. Well, do I have some bombshells for you guys.''

I was a programmer at Argonaut from 1992 until it was liquidated in 2004 so I've seen sh*t that no one else has outside the company.

''Whilst we were working on Star Fox 2, my mate Giles let me see a secret project he was working on. It seemed to be some sort of console (later revealed to be the Ultra 64) hooked up to his computer through a dev kit. He booted up the monitor to reveal a low poly Yoshi in a go-kart driving around a flat plane next to his house. There were no animations, simple textures and no real content other than driving around. But I was impressed at the framerate he was getting (around 35fps with a little bit of stutter here and there) and how great the 3D effects looked. But the skybox choice was a little unsettling, if not creepy.''

''Giles said that he would present the ROM to Nintendo in hopes that they could develop the flagship title for the system. I guess it didn't go so well because if I ever brought it up again in conversation, Giles would get quite sour and deny its existence.''

''A couple of years later, I was playing Super Mario 64. I had collected around 34 stars and entered Wet Dry World. As I started the first star, my jaw dropped, the skybox was the exact same as the one in Yoshi Racing.''