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The '''Cooperative Testing Initiative''', or simply '''co-op''', is a multi-player gamemode and campaign in ''[[Portal 2]]'' whereby two players can join up and take part in test courses built specifically for cooperative testing.
The '''Cooperative Testing Initiative''', or simply '''co-op''', is a multi-player gamemode and campaign in ''[[Portal 2]]'' whereby two players can join up and take part in test courses built specifically for cooperative testing.
Most beginners (or players who made a [[Cooperative_Testing_Initiative#Reset_progress|reset]] recently) start from ''[[Portal 2 Co-op Calibration Course|Calibration Course]]'' - the first [[Test Chamber]] during [[Portal 2]]'s [[Cooperative Testing Initiative]].
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{{Clr}}
== Overview ==
== Overview ==
Players take the form of two robot test subjects built by [[GLaDOS]], [[Atlas]]; the short and round blue bot, [[P-body]]; the tall and pea-shaped orange bot that looks like a turret with arms and legs. Each bot comes equipped with their own [[Handheld Portal Device]] with separate [[Portals|portal]] colors. The portals are capable of maintaining the flow of things, even if it enters a partner's portal, which is essential during some test chambers.
Players take the form of two robot test subjects built by [[GLaDOS]], [[Atlas]]; the short and round blue bot, [[P-body]]; the tall and pea-shaped orange bot that looks like a turret with arms and legs. Each bot comes equipped with their own [[Handheld Portal Device]] with separate [[Portals|portal]] colors. The portals are capable of maintaining the flow of things, even if it enters a partner's portal, which is essential during some test chambers.
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== Courses ==
== Courses ==
==== Course One: Team Building ====
{{main|Portal 2 courses during Cooperative Testing Initiative}}
{{spoiler|This is one of the first courses available to the player upon entering the Hub, the others remaining locked until the other courses are completed. In this course, the players are given basic tests that emphasize the use of teamwork through portals and ''pinging'', which is a function that allows players to communicate even without text or even through voice. Pings come in a variety of forms, from a simple "Look" ping, to a "Timer" ping that can be used to coordinate timed events effectively.}}
{{:Portal 2 courses during Cooperative Testing Initiative}}


==== Course Two: Mass and Velocity ====
== Credits ==
{{spoiler|After completing Course One, this course will unlock for players to continue testing. This chamber utilizes the effects portals have when an object has both mass and velocity as it enters the portal, meaning the players must utilize both in order to pass this course.}}
{{main|Cooperative Testing Initiative/Credits}}


==== Course Three: Hard-Light Surfaces ====
== Features ==
{{spoiler|This course opens up upon completion of Course Two. In this course, the players must make use of the Light Bridges to both navigate chambers and act as a wall for other chambers as a defense mechanism or a creative way of stopping something from hurtling into acid. This course takes place in the Decayed/ruined look/style from the first 4 chapters in the singleplayer.}}
=== Split screen ===
Read [https://developer.valvesoftware.com/wiki/Testing_Portal_2_Co-Op_Maps_Alone ''Testing Portal 2 Co-Op Maps Alone''].


==== Course Four: Excursion Funnels ====
=== Split screen alone ===
{{spoiler|This course unlocks upon completion of Course Three. During this course, the player will have to make use of both Light Bridges and Excursion Funnels in order to complete these chambers. It will employ elements from the previous courses as well, making it much more difficult as the players progress. Apparentely this courses were made by GLaDOS for the bots themselves since she thought they weren't going to make it that far and just used tests for humans.}}


==== Course Five: Mobility Gels ====
=== Reset progress ===
{{spoiler|This is the final course that unlocks after the completion of Course Four. Upon entering, GLaDOS will chime in and explain the significance of Atlas and P-Body's testing and what their true purpose is. The players are then dropped into the defunct Aperture testing spheres encountered during single player, and must make use of all elements from the previous chambers along with the Gels that are found in the course. The final course is very difficult, requiring both players to act as a true team. The last chamber is halted by a large vault door, which holds the frozen humans inside. Both players must perform any gesture to ultimately unlock the door. This course takes place in The 50-80's era Aperture from the sixth and seventh chapters of the singleplayer}}
Note that these commands affect both players and cannot be undone (except with {{code|mp_mark_all_maps_complete}}):
# {{code|mp_mark_all_maps_incomplete}}
# {{code|changelevel}} [[Hub|mp_coop_lobby_2]]


== Additional Courses ==
== Notes==
==== Art Therapy ====
* The [https://steamcommunity.com/my/friends/blocked Steam blacklist] doesn't work and players will be matched with blacklisted users.
Set after the conclusion of the Mobility Gels course, GLaDOS has reassembled the bots for testing again and claims that it has been 100,000 years since they were last reassembled. {{spoiler|As the testing progresses, the bots are able to observe the defunct surroundings of the Enrichment Center, which GLaDOS assures them as part of an "art exhibit". Further on in the course, players will be sent to a Robot Assembly Annex station to repair their own reassembly machines as GLaDOS finally makes it clear that it has only been a week since the Mobility Gels course and that she needs their help in restoring her control over the facility as something is overriding her controls. At the end of the course, both players are sent out of the testing area to resolve the problem in a control room housing a prototype chassis of the [[Cores#Central Core|central core]]. While the first 8 test chambers take place in the "Remaster" clinical look, the last chamber takes place in the 50-80's era Aperture}}
 
Interestingly, the sixth course was initially going to consist of advanced test chambers during ''Portal 2''<nowiki>'</nowiki>s development, months before the game was released. However, this was scrapped and was removed from the final game. The [[Peer Review]] DLC to ''Portal 2'' instead adds only challenge modes to single-player and co-op, with no sign of advanced test chambers. The Art Therapy course is referred to as an additional course instead of the "sixth course".
 
====Non-Emotional Manipulation====
All owners of the Sixense MotionPack DLC receive this course for free. It makes use of the new Portal Surfing and One-to-One mechanics.


== Gallery ==
== Gallery ==
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|height=150
|height=150
|width=150
|width=150
|File:Atlas.png|alt1=Atlas|[[Atlas]]
|File:P-body.png|alt2=P-body|[[P-body]]
|File:Atlas first person.png|alt3=Atlas first-person view.|Atlas first-person view.
|File:Atlas_both_portal.png|alt4=Both of Atlas' portals|Both of Atlas' portals
|File:P-body first person.png|alt5=P-body first-person view.|P-body first-person view.
|File:P-body_both_portal.png|alt6=Both of P-body's portals|Both of P-body's portals
|File:Bots_Screenshot.png|alt7=Atlas in Roll Cage|Atlas in the [[Roll Cage]]. P-body is located behind Atlas's frying pan, also in a roll cage
|File:Bots_Screenshot.png|alt7=Atlas in Roll Cage|Atlas in the [[Roll Cage]]. P-body is located behind Atlas's frying pan, also in a roll cage
|File:Early models with red eyes.jpg|alt8=Early models with red eyes.|Early models with red eyes.
|File:Portal 2 PC Gamer 01.png|alt9=Prerelease screenshot of Atlas and P-Body.|Prerelease screenshot of Atlas and P-Body.
|File:Atlas and p-body.png|The bots in a Aperture Science blueprint format
|File:Atlas and p-body.png|The bots in a Aperture Science blueprint format
}}
}}


== Related Achievements ==
== Related Achievements ==
=== Portal 2 ===
{{Achievement table
{{Achievement table
| 1 = {{Show achievement|Portal 2|You Saved Science}}
| 1 = {{Show achievement|Portal 2|You Saved Science}}
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== See also ==
== See also ==
* [[Hub]]
* [[GLaDOS]]
* [[Chell]]
* [[Chell]]
* [[Perpetual Testing Initiative]]
* [[Perpetual Testing Initiative]]
{{TestChambersNav}}
{{Portal2Co-opTestChambersNav}}
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