Subcon

Subcon is a peaceful dream land located in the Mushroom World; originally believed to be a mere figment of Mario's subconscious imagination, the land is actually unveiled as a real place. Subcon is home to many strange creatures, such as Birdos and Shy Guys, and has many strange methods of transportation, including door-creating potions and falcon-shaped portals. A tyrannical frog king named Wart once took over and enslaved Subcon, but was ultimately defeated by Mario, Luigi, Peach, and Toad ("Super Mario Bros. 2")—all four of them subsequently waking up back in the Mushroom Kingdom.

In the "Dimension" saga, one of the sacred elements (that of water) is sent here from Frogger's dimension; upon being discovered by Wario and Waluigi, the element is used to flood the entirety of Subcon so that the two of them can mine for gold. The alliance of heroes soon makes its way to Subcon and travels through its many areas, using turnips and potions to create doors and bypassing flooded areas to eventually reach a portal leading to one of the caves. The Battle at Subcon  involves the alliance first battling the Wario Bros, and then everyone fighting Mr. D, Treeby, and Tank—the end result being the removal of the flood and the alliance claiming the water element (as well as reclaiming the fire element, bringing their total up to three). Trivia


 * The evil frog king called Wart in "Super Mario Bros. 2" is not to be confused with the character Wart from "Frogger 2: Swampy's Revenge," subsequent member of the alliance of heroes in the "Dimension" saga.