Bowser's Castle (Mario Kart Arcade GP DX)

Bowser's Castle is a race course in Mario Kart Arcade GP DX, appearing in the second and fourth rounds of the Bowser Cup (which is only available for 100cc and up), while its counterpart, Bowser's Factory, appears in the first and third rounds of the same cup. The course uses a revamped layout of Castle Wall of Mario Kart Arcade GP and Mario Kart Arcade GP 2, but is very different in comparison, as notably, the eponymous castle wall is not present in this incarnation of Bowser's Castle.

The course starts similarly to Bowser's Factory: racers enter the castle (with a giant statue of Bowser looming over the gateway), and make a hairpin turn in a room full of lava, and mechanics such as gears and pistons. However, instead of then driving straight into the factory section, racers are instructed to turn left, leading them through another lava room into some sort of engine room-like dungeon, where Dry Bones are spectating the race. This section consists of a curved path with Dash Panels, leading upwards around a Koopa Clown Car-like structure, to the exit of the room, leading racers outside the castle, high above volcanic ground. Using a Glide Ramp, racers will be able to glide safely towards the other end, leading them towards a structure labeled "Kamek's Laboratory". Inside the laboratory is another dungeon-like area with green-glowing grates decorating the floor. Racers have to follow the curved path inside the laboratory, around a large hologram of Kamek. Once exiting the laboratory, racers drive over a paved road that leads them to a cliff. Following the cliff's path lead them back to the entrance of the castle.