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Undo revision 22185 by Wormhole (talk) This is the English page.
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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]]. | |||
== | == Gels == | ||
''Portal 2'' | Introduced in ''Portal 2'', [[Gels]] can be applied on any surface in order to modify its attributes. | ||
* [[Repulsion Gel | * [[Repulsion Gel]] is a blue gel that bounces a player or object away from the surface. | ||
[[Category:Gameplay | * [[Propulsion Gel]] is an orange gel that accelerates objects touching it, allowing players to run forward at high speeds. | ||
* [[Conversion Gel]] is a white gel that allows portals to be placed on surfaces that portals normally cannot be placed. | |||
[[Category:Gameplay]] | |||