Bowser's Castle is a location found in the game, A Koopa's Revenge. It is the first world that Koopa passes in the game and is where the adventure truly begins. On the map, it is situated at the south-west corner. The setting of this world is fortress-themed. Inside is filled with enemies and obstacles such as Yoshis, Toads, Birdies and the lava. Once Koopa has conquered Bowser's Castle, he then proceeds to Mushroom Forest. The boss of this area is Wario.
Levels
This area contains a total of three levels, excluding the Training Level, which is optional. Bowser's Castle 3 contains the area's boss.