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Castle Wall is a course in Mario Kart Arcade GP and Mario Kart Arcade GP 2. The course is set on the upper walls of Bowser's Castle. In fact, the course starts out in Bowser's Castle, but the change of road leads players to the upper walls of the castle. Castle Wall is more linear than Bowser's Castle, due to the long straights.
Castle Wall later appears in Mario Kart Arcade GP DX, now with several tweaks in design and renamed into Bowser's Castle. The original Bowser's Castle track would become Bowser's Factory.