From the Super Mario Wiki
The Blue Biddybuggy is a kart that appears in the Mario Kart series. Originally a color scheme for the Biddybuggy in Mario Kart 8 and Mario Kart 8 Deluxe, the kart returns as a separate vehicle in Mario Kart Tour, where is classified as a tour-exclusive Normal kart. Like with the Biddybuggy, Pipe Buggy, and Pipe Frame, slipstreaming lasts longer and yields more points when using this kart. The Blue Biddybuggy could be unlocked during the Tokyo Tour, where it was part of a Tour Gift for Gold Pass members after getting 132 Grand Stars. Like the original Biddybuggy, the emblem is located on the forehead and it uses the Standard tires from Mario Kart 8 and Mario Kart 8 Deluxe.
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