From the Super Mario Wiki, the Mario encyclopedia
The Black Circuit is a kart that appears in the Mario Kart series. It was originally a color scheme for the Circuit Special in Mario Kart 8 and Mario Kart 8 Deluxe; however, in Mario Kart Tour, it appears as a separate vehicle, classified as a High-End kart. Like the Circuit Special, it uses the Slick tires from Mario Kart 8 and Mario Kart 8 Deluxe. Also like the Circuit Special, this kart increases the duration of slipstreams and the amount of points earned for performing one.
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