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[[File:Bounce.png|right|135px|Don't get covered by the gel.]]
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{{Quotation|'''Cave Johnson'''|We haven't entirely nailed down what element it is yet, but I'll tell you this: It's a lively one, and it does NOT like the human skeleton.|sound=Cave_Johnson_fifties_second_test_complete02.wav}}
 
'''Gels''' are a gameplay [[Mechanics|mechanic]] officially introduced in ''[[Portal 2]]''. They are paint-like liquids that impart different effects when applied to [[surfaces]] and objects. Gel cannot be applied to transparent surfaces (such as glass), and will pass through grating (also without painting it). Most test elements also cannot be coated in gel, with the exception of [[Cubes]] and [[Turrets]]. Cubes and turrets cannot be coated in Conversion Gel.
 
== Gels ==
[[File:RepulsionGel.png|left|170px|border]]
=== Repulsion Gel ===
{{main|Repulsion Gel}}
 
This gel is a light blue substance that provides repelling abilities. Any objects like the [[Storage Cube]]s and [[Turrets]] that hits a surface coated with the Repulsion Gel, will either bounce away from the gel patch or bounce erratically on its own upon being coated with it. Due to the effect, the height from which a test subject falls before landing on a gel-covered surface affects the height of a jump. Test subjects can also use the Gel to move back and forth between two parallel surfaces rather than merely be propelled up and down.
 
{{Clr}}
[[File:PropulsionGel.png|right|170px|border]]
 
=== Propulsion Gel ===
{{main|Propulsion Gel}}
 
The Propulsion Gel is a light orange substance that greatly increases object velocity and reduces the friction of objects moving on the surface(s) it is applied to. Any objects covered in this gel have their friction reduced, causing them to slide around across the floor easily. In other words it just makes anything that touches it, and runs on it, fast.
 
{{Clr}}
[[File:ConversionGel.png|left|170px|border]]
=== Conversion Gel ===
{{main|Conversion Gel}}
 
A portal-conducting white substance {{spoiler text|made from ground moon rocks}}. It enables test subjects to fire [[portals]] onto [[surfaces]] previously incapable of conducting portals. [[Cubes]] and [[Turrets]] cannot be coated in Conversion Gel
 
{{Clr}}
[[File:CleansingGel.png|right|170px|border]]
=== Cleansing Gel ===
This gel may appear to be regular water with an ability to wash away other types of gels off of surfaces and any objects that have been coated. It is destroyed upon touching anything. It has no special properties in regard of the gameplay, and as such, does not affect any surfaces other than ones covered in other gels.
 
{{Clr}}
=== Slime ===
'''Slime''' or '''Sewage''' was found only in ''[[Portal]]'' during [[Chell]]'s escape. While not technically a gel, it does have some properties similar to gels in ''Portal 2'', such as the slippery effect of running on Propulsion Gel and an adhesion effect that keeps Chell somewhat stuck on the surface. It has no emitter, is not used to solve chambers, and it cannot be "painted" onto surfaces like the gels introduced in ''Portal 2''.
 
== Unused/cut gels ==
=== Adhesion Gel ===
{{main|Adhesion Gel}}
 
Adhesion Gel is a cut gel which was originally meant to allow the player to walk on walls, similarly to the blue Stick paint in ''Tag: The Power of Paint'', which Portal 2's gel mechanics are based on. The gel was made purple as a placeholder; it was cut before the developers decided on a final color, so it remains purple in the final game. The gel was cut because many play testers experienced motion sickness and disorientation, having to think with portals while walking on walls and ceilings. Most of the gel's effects were removed in the final game, except one: cubes coated in Propulsion Gel will not slide across Adhesion Gel-coated floors, and vice-versa.
 
The gel was replaced by Reflection Gel in the Peer Review update.
 
=== Reflection Gel ===
{{main|Reflection Gel}}
Reflection Gel replaced Adhesion Gel in the [[Peer Review]] DLC. It appears the same color as Conversion Gel when painted on surfaces, and the color of Propulsion Gel when splatted on the screen. The [[Thermal Discouragement Beam]] will reflect off of it like a mirror, similar to the [[Discouragement Redirection Cube]]. It also retains Adhesion Gel's effect of counteracting Propulsion Gel.
 
== Related achievements ==
{{Achievement table
| 1 = {{Show achievement|Portal 2|Vertically Unchallenged}}
      {{Show achievement|Portal 2|White Out}}
| 2 = {{Show achievement|Portal 2|Stranger Than Friction}}
      {{Show achievement|Portal 2|Schrodinger's Catch}}
}}
 
== Gallery ==
{{Gallery
|title = Gels
|height = 150
|width = 150
|lines = 3
|File:Repulsion Gel.png|Repulsion Gel spraying out of its tube in the 50s-70s layouts of [[Aperture Science|Aperture]].
|File:Propulsion Gel.png|Propulsion Gel.
|File:Conversion Gel.png|Conversion Gel.
|File:Water.png|Cleansing Gel.
|File:Repulsion Gel Cube.png|A [[Weighted Storage Cube]] covered in Repulsion Gel.
|File:Propulsion Gel Cube.png|A Cube covered in Propulsion Gel.
|File:Repulsion Gel Turret.png|A [[Turrets#Sentry Turret|turret]] covered in Repulsion Gel.
|File:Propulsion Gel Turret.png|A [[Turrets#Sentry Turret|turret]] covered in Propulsion Gel.
}}
 
== Trivia ==
* The gel mechanic is a borrowed concept from ''[[TAG: The Power of Paint]]''.
** A fourth gel, "[[Adhesion Gel]]", was also borrowed from ''TAG'' and was tested within ''Portal 2''. It would have allowed players to "stick to a surface so you can walk up a wall like Fred Astaire in ''Royal Wedding''"<ref>Chapter 8, page 2 of ''[[Portal 2 - The Final Hours]]''.</ref>; however, it was removed early on during development due to making play-testers motion-sick.<ref>Chapter 8, page 4 of ''Portal 2 - The Final Hours''.</ref> Its emitter is still in the game's files, however, but does not have any sticky properties or a texture.<ref>Sticky gel in-game test [http://www.youtube.com/watch?v=U-A1s67wK2Q]</ref>
 
* Repulsion Gel was [[Aperture Science]]'s first attempt at creating dietetic pudding substitute.
 
* Blue-painted physics objects are actually bouncy if the jump key (Default: {{Key|Space}}) is pressed on them. However, this is impractical and hard to pull off.
 
== See also ==
* [[Mechanics]]
 
== References ==
<references/>
 
 
{{MechanicsNav}}
[[Category:Mechanics]]

Revision as of 16:08, 15 April 2023

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