From the Super Mario Wiki
Waluigi Stadium is a race track that appears in the Mario Kart series and is owned by Waluigi. The stadium as seen in Mario Kart: Double Dash!! and Mario Kart Wii is very much like a dirt bike course, with hazards such as mechanical Piranha Plants coming out of pipes and spinning, three-armed Firebars.
Another Waluigi Stadium appears in Mario Kart Arcade GP 2, but in a different race course.
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