[Term] Area [Description] 
An area is used to define a level that, literally, physically coexists amongst multiple levels, in that the player can progress from one "level" to the other simply by using the game's physics. Despite coexisting spatially, each area presents its own themes, rewards and challenges. Access to areas is often designed to require learning and progression gained from other areas. An area that serves as the only direct access to all other areas is known as a "hub".