Valve showed off the first gameplay footage of the Portal 2 coop mode, set to be one of the highlights of the game. The walkthrough video shows us glimpses of some of the new features and gameplay mechanics which will play a key role in the coop mode. Check out the 9 minute Portal 2 Coop Mode Walkthrough below,

We’ve also received a bunch of screenshots from Valve,(Click on image to view in gallery)









































