One of three Kingdoms/Stages that a player can unlock outside of the Main Story is Mushroom Kingdom. Like previous Super Mario Games, Mushroom Kingdom is primarily made up of Princess Peach's Castle. Here, Mario can find Yoshi on the rooftop of the castle, Archivist Toadette within one of the castle rooms, and yet another Captain Toad. In order to unlock Mushroom Kingdom, all a player must do is save Princess Peach from Bowser and complete the Main Story.