Cooperative Testing Initiative

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Co-op bots Atlas and P-body, in Portal 2.
These next tests require cooperation. Consequently, they have never been solved by a human. That's where you come in. You don't know pride; you don't know fear. You don't know anything. You'll be perfect.
GLaDOS

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.

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 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.

There are five official testing courses, each with a number of test chambers within, which will test both the robots' ability to solve the different puzzles as they progress. Each chamber becomes much harder than the last, with the final test taking place outside the official Aperture testing facilities. In these tests, the bots are then put to the test, so to speak, and must use every bit of knowledge earned about the previous tests in the final one.

For the last chambers of each courses, excluding the fifth, the bots are instructed by GLaDOS to go out and locate a certain disk to be inserted into a DVD player found at the end of the course. Once found and inserted within the device, the players are given a few lines from GLaDOS before she triggers a self-destruct sequence on the duo. This is the only means of retrieving them back to the Hub.

During the testing, GLaDOS will periodically chime in and say a few choice words, either to bemoan the bots' progress or point out their tiny flaws. She even goes beyond to try and break their partnership by pointing fingers at one or the other. If either both or one of the bots' stands within range of GLaDOS' monitoring cameras and perform a gesture, it will elicit her response, depending on the gesture performed.

In this campaign, the bots will be notified that their partner has been destroyed and exactly where it did. The destroyed bot will be easily rebuilt seconds later in a chute from the Reassembly Machine. The gamemode gives an infinite amount of lives, and GLaDOS will comment on every death that occurs with dry humor or irritability. As the bots progress, they will cross checkpoints that lead into the next part of the test chamber. Checkpoints allow the bot that died to respawn at the checkpoint for shorter travel time to the next testing chamber.

Courses

Main article: Portal 2 courses

Portal 2 courses

Gallery

Related Achievements

Portal 2

You Saved Science
You Saved Science
Complete all test chambers in all courses of co-op
Team Building
Team Building
Complete all test chambers in the Team Building co-op course
Triple Crown
Triple Crown
Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each
Still Alive
Still Alive
Complete Course 4 with neither you nor your co-op partner dying
Rock Portal Scissors
Rock Portal Scissors
Win 3 co-op games of rock-paper-scissors in a row
Professor Portal
Professor Portal
After completing co-op, complete Calibration Course online with a friend who hasn’t played before
Portal Conservation Society
Portal Conservation Society
Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements
Party of Three
Party of Three
Find the hidden companion cube in co-op test chamber
Obstacle Building
Obstacle Building
Complete all test chambers in the Excursion Funnels co-op course
Narbacular Drop
Narbacular Drop
Place a portal under your co-op partner while they are gesturing
Iron Grip
Iron Grip
Never lose a cube in Chamber 6 of the Mass and Velocity co-op course
High Five
High Five
Celebrate your cooperative calibration success
Gesticul-8
Gesticul-8
Perform all 8 gestures of your own volition in co-op
Friends List With Benefits
Friends List With Benefits
While playing co-op, hug 3 different people on your friends list
Four Ring Circus
Four Ring Circus
Enter 4 different portals without touching the ground in co-op
Empty Gesture
Empty Gesture
Drop your co-op partner in goo while they are gesturing by removing the bridge under them
Confidence Building
Confidence Building
Complete all test chambers in the Mass and Velocity co-op course
Can't Touch This
Can't Touch This
Dance in front of a turret blocked by a hard light bridge in co-op
Bridge Building
Bridge Building
Complete all test chambers in the Hard-Light Surfaces co-op course
Asking for Trouble
Asking for Trouble
Taunt GLaDOS in front of a camera in each of the five co-op courses
Air Show
Air Show
Perform 2 aerial gestures before touching the ground in co-op
Talent Show
Talent Show
Never lose a cube in Chamber 6 of the Mobility Gels co-op course

See also