Princess Peach's Castle is where Princess Peach lives and rules over the kingdom with her loyal adviser; Toadsworth. But in Mario & Luigi: Bowser's Inside Story, the royal castle is taken over by the evil Fawful and his assistant Midbus. It is later used as a weapon.

In Mario & Luigi: Partners in Time, in the past, it is revealed that the Shroobs took it over and turned it into Shroob Castle.

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