Layered Level Design
Layered Level Design :
A general term that describes a particular way a level creates density and variety of distinct gameplay challenges. This density is only achievable by including optional challenges, otherwise the level design would be classified as linear or straightforward. one method of creating layered levels involves designing straightforward gameplay challenges that are "stacked" on top of each other so that the player can experience the layers simultaneously or organically by moving back and forth between them. Another way to do layered level design is creating a level that presents distinct challenges based on what players bring to the challenge (co-op, powered up, etc.). This can be achieved through various kinds of locks and sequence breakable level design
