The Cooperative Testing Initiative, or Co-op for short, is the separate game mode where two players can join up and take part in test chambers built specifically for cooperative play. The players take the form of either Atlas, the short and blue bot, or P-body, the tall and orange bot. 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.
Atlas and P-body, the Co-op bots, 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
|
” |
There are five test courses, each with several testing chambers within, which will test both players' ability to solve the different puzzles as they progress. Each chamber becomes much harder than the last, with the final test taking place outside of the official Aperture testing facilities. In these tests, the players 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. The last chambers of each course, excluding the fifth, the players are told to go out and locate a certain disk for the 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 exploding violently. This is the only means of getting out of the test chamber. Upon completion, players are then returned to the Hub.
During the testing, GLaDOS will periodically chime in and say a few choice words, either to bemoan the players' 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 the player stands within range of one of GLaDOS' monitoring cameras and perform a gesture, it will elicit a response from GLaDOS, depending on the gesture performed. Players do not have to fear death while testing, as it's commonplace in the machine world. If a player dies, the other player will be given an indication that the other has died and where they died. The dead player will then respawn moments later from the chute the Reassembly Machine sends them through, ready for a second try. The players have an infinite amount of lives, and GLaDOS will comment on every death that occurs with dry humor or irritability. As players progress, they will cross checkpoints that lead into the next part of the test chamber. The checkpoints will allow players who die to respawn at the checkpoint for shorter travel time to the next testing chamber.
Courses
Course One: Team Building
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.
Course Two: Mass and Velocity
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.
Course Three: Hard-Light Surfaces
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 a water hazard.
Course Four: Excursion Funnels
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.
Course Five: Mobility Gels
This is the final course that unlocks after the completion of Course Four. Upon entering, GLaDOS will chime in the explain the purpose of the 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.
Course Six: Advanced Chambers
There is evidence within the game's localisation files that there was a sixth course of Co-op chambers during Portal 2's development: Advanced Chambers. Valve has said that in an upcoming DLC, advanced Test Chambers will be introduced to both Single player and Co-op play of Portal 2. There is no known information why these chambers were not available at the launch of Portal 2.
Gallery
| P-body first-person view.
|
|
Related Achievements
Portal 2
|
|
You Saved Science
Complete all test chambers in all courses of co-op
|
|
|
Team Building
Complete all test chambers in the Team Building co-op course
|
|
|
Triple Crown
Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each
|
|
|
Still Alive
Complete Course 4 with neither you nor your co-op partner dying
|
|
|
Rock Portal Scissors
Win 3 co-op games of rock-paper-scissors in a row
|
|
|
Professor Portal
After completing co-op, complete Calibration Course online with a friend who hasn’t played before
|
|
|
Portal Conservation Society
Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements
|
|
|
Party of Three
Find the hidden companion cube in co-op test chamber
|
|
|
Obstacle Building
Complete all test chambers in the Excursion Funnels co-op course
|
|
|
Narbacular Drop
Place a portal under your co-op partner while they are gesturing
|
|
|
Iron Grip
Never lose a cube in Chamber 6 of the Mass and Velocity co-op course
|
|
|
|
|
High Five
Celebrate your cooperative calibration success
|
|
|
Gesticul-8
Perform all 8 gestures of your own volition in co-op
|
|
|
Friends List With Benefits
While playing co-op, hug 3 different people on your friends list
|
|
|
Four Ring Circus
Enter 4 different portals without touching the ground in co-op
|
|
|
Empty Gesture
Drop your co-op partner in goo while they are gesturing by removing the bridge under them
|
|
|
Confidence Building
Complete all test chambers in the Mass and Velocity co-op course
|
|
|
Can't Touch This
Dance in front of a turret blocked by a hard light bridge in co-op
|
|
|
Bridge Building
Complete all test chambers in the Hard-Light Surfaces co-op course
|
|
|
Asking for Trouble
Taunt GLaDOS in front of a camera in each of the five co-op courses
|
|
|
Air Show
Perform 2 aerial gestures before touching the ground in co-op
|
|
