Bowser's Castle (Mario Kart Arcade GP)

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Bowser's Castle is a race course in Mario Kart Arcade GP and its successor as the first course in Bowser Cup, appearing before Castle Wall. Racers first enter the castle through an opening that resembles Bowser's head, not too different from Mario Kart Double Dash!!. They go through a hallway and end up in Bowser's throne room, covered with lava. After this area, racers can see Thwomps (their design is very similar to ones seen in Super Mario Bros. 3) and a hallway with medieval armor for Koopa Troopas. Bowser Jr. can be seen, standing on his throne and cheering at players. The racers eventually leave the castle and arrive back at the starting line.

In Mario Kart Arcade GP DX, the course is remolded and now goes under the title Bowser Factory, while Castle Wall would take the Bowser's Castle name for itself. Here, in the new racetrack (Bowser Factory), a factory section was added with Bob-ombs, a Big Bob-omb, and, after that section, there is a very large Thwomp that doesn't crush players due to two platforms preventing it from collapsing.