Sitting on the eastern edge of Marshroom Kingdom, this castle is the home field of Mowser and his army of Doopa Troopas. The stone exterior is painted brick red, and numerous towers jut from it with little rhyme or reason. The only obvious entrance is a tremendous drawbridge at the front. With the bridge raised, the castle is seemingly impossible to enter, separated by a raging river stocked with rabid piranhas. However, there are numerous secret entrances dotting the walls; knowledge of their locations is shared only to Mowser's most trusted allies.