Portal 2 Co-Op - PT 9

This is part nine of our Portal 2 Cooperative walkthrough that covers the Mass and Velocity Course, test chamber 2. For a full written walkthrough of both the single player and cooperative campaigns of Portal 2, check out http://www.gamefront.com/portal-2-walkthrough Also please dont forget to subscribe to gamefront for all of the best Portal 2 videos and much more.