From the Super Mario Wiki, the Mario encyclopedia
Stadium Arena (known as Arena Stadium in Europe) is a track in Mario Kart Arcade GP 2. Along with Waluigi Stadium, Stadium Arena makes up half of the Waluigi Cup and is Waluigi's home stage, as both courses are decorated with banners themed after him. Both courses also feature several Tamagotchi-themed advertisements, after Mametchi. Stadium Arena is designed like a dirt-bike styled track with several small hills. Near the middle of the track is a short tunnel. The overall shape of Stadium Arena resembles that of a trapezoid. Robotic dinosaurs can be found on the course.
In the European version of the game, despite it being named Arena Stadium in this version, the announcer claims it is Stadium Arena at the start of the race.