Inverted State is an option for world state. The premise is that the player starts in the Dark World, and must find items to either Defeat Agahnim or to access the light world. Without the Moon Pearl, Link will not be able to retain his shape in the Light World. Additionally, the Magic Mirror will teleport you from the Light World to the Dark World. Many changes have been made to the map to allow specific items and locations to be accessible. You can view a full list of changes on the Game Options page on the Randomizer Site under the World State section.