From the Super Mario Wiki
Battle Stadium is a battle course in the upcoming game Mario Kart 8 Deluxe, appearing as one of the new courses added to the game. Battle Stadium bears a slight resemblance to Mario Kart Stadium, made in an "8" shape signifying the game's title with ramps in several areas along with an anti-gravity ring around the middle. The course is fairly simplistic in design. Underneath the Battle Stadium appears to be a small town with several other vehicles driving along the roads.
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