There are two types of map/room changes in Final Fantasy IV: "Go" types and "Return" types. "Go" types save the player's location, and "Return" types go back to a saved location. Locations without a clear cut "Go" or "Return" purpose are "Go" types, whether coming or going. Outside, the player is at Room Level 0, but every time one enters a room the "Room Level" increments. Each time one exits something, the Room Level will decrement. The glitch can be performed in places where one can continually increment the Room Level.