Surfaces: Difference between revisions

Each level within the ''Portal'' series consists of '''surfaces'''. Typically, a [[Portals|portal]] can be placed upon any light-colored flat surface, whereas an uneven or dark surface cannot be used in this way. Similarly, the dark metal panels present in [[Portal]]'s [[Test Chambers]] are present for the express purpose of requiring the player to consider other techniques in order to solve the puzzle(s). In this way, the placement and location of portal-conductive surfaces is a fundamental design choice, and determines the way in which the puzzle(s) need to be solved.  

In some Test Chambers, surfaces are blocked by doors or other obstacles, or must be [[Button|activated]] before a portal can be placed upon them. In [[Portal 2]], the only way to overcome some puzzles that lack portal-conductive surfaces is through the use of [[Gels]].