Sketch
Description
A sketch refers to a preliminary or rough visual representation of a game level, concept, object, character, or element. Sketches are informal and often quick drawings or diagrams used by designers, artists, and developers to brainstorm ideas, explore concepts, and communicate visual or spatial aspects of a game.
Concrete Examples
Sketch of a Halflife 2 level as in Totten 2019 - An Architectural Approach of Level Design
Level Parti Sketches of a fence in SWARM! as in Totten 2019 - An Architectural Approach of Level Design
3D Sketch of the layout of a level in Portal 2, as in the Level Design Book
...