In September 2020, as part of a massive leak of documents and files from developer Data Design Interactive, a prototype build of Myth Makers Super Kart GP was found containing two different early pitches for the game. The internal name for the overall build is "NickKart", as it was originally pitched as a Nickelodeon-themed kart racer in a similar vein to Nicktoons Racing using certain models from Nickelodeon Party Blast, another game made by Data Design. Leftover voice clips from this prototype would also be discovered in the data for a prototype of the Data Design game Casper and the Ghostly Trio. The second pitch was for an Adiboo-themed racing game, with only two models and a background graphic remaining in the Myth Makers prototype's files.