"As our data clearly shows, humans cannot be trusted." -Cave Johnson Lets see if your partner is as reliable as you think they are. Update (2012-10-30): The main chamber has been modified so that it can now manufacture two linked challenges at once. The en...

Be sure to make use of the 'tab' function in which you can see what your partner sees. Keep in mind in cooperative chambers you must employ two sets of portals. Teamwork and communication is key to completing any cooperative test chamber....

Keep an eye on your partners camera. Communication is also helpful....

Seems Hard. It's Hard. This test requires cooperation. Good Luck. Difficulty: Intermedium...

This is my first co-op map, and the first of a series. You will be required to solve this as a team. The map is divided into 3 sections with a different kind of gameplay. Beating each section will give access to a corridor getting there faster in case you'...

Traverse though the vents of this test with a bud....

A co-op map outlining light bridge ramp techniques....

Be sure to make use of the 'tab' function in which you can see what your partner sees. Keep in mind in cooperative chambers you must employ two sets of portals. Teamwork and communication is key to completing any cooperative test chamber....

Yes, it's a maze. But a co-op maze! Edit: Now with restart points (death traps) and a wider area (for increased visibility)....

Be sure to make use of the 'tab' function in which you can see what your partner sees. Keep in mind in cooperative chambers you must employ two sets of portals. Teamwork and communication is key to completing any cooperative test chamber....