From the Super Mario Wiki
Figure-8 Circuit is the first race course of the Mushroom Cup in Mario Kart DS, as well as the location of the awards ceremony held after any cup. The race track resembles an 8. It is comparable to Luigi Circuit of numerous other Mario Kart games, as simple, straightforward, and free of gimmicks. This race course has a different introduction fanfare on Grand Prix, which is shared with Waluigi Pinball, Mario Circuit (with which it also shares its music) and GCN Luigi Circuit.
In Super Smash Bros. Brawl and Super Smash Bros. for Wii U, there is a Mario Kart-themed course entitled "Mario Circuit" that has a similar layout to Figure-8 Circuit. The stage reappears under the name "Figure-8 Circuit" in Super Smash Bros. Ultimate.
Missions 1-1 and 2-2 take place on this circuit. The first requires the player to pass through 5 gates in order and the second requires them to collect 10 coins.
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