From the Super Mario Wiki
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The Waluigi Cup is a cup that appears in the Mario Kart series. It first appears in Mario Kart Arcade GP 2, where it is the first normal cup. It contains two Waluigi-themed courses, both of which take place in the same general area and are similar to other stadium tracks in the series. The layout of the two courses in this cup would later be reused for Aerial Road and Sky Arena in Mario Kart Arcade GP DX.
The cup makes a reappearance in Mario Kart Tour. Here, all courses featured in this cup have Waluigi as the primary or secondary favored character.
Mario Kart Arcade GP 2
Mario Kart Tour