Bowser's Castle (also known as Bowser's Keep in Super Mario RPG: Legend of the Seven Stars, Bowser Castle in Mario & Luigi: Bowser's Inside Story or Castle Koopa in the Mario TV series) is King Bowser's home and the base of operations for the Koopa Troop. Bowser has a variety of different castles throughout the Mushroom World, each of which usually functions as an important base from which the Koopa King formulates his plans. Bowser's Castle is usually the final area that Mario visits to rescue Princess Peach, and is usually guarded by Bowser's most powerful minions.

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