Valve were showing off the cooperative play from Portal 2 for the first time at this year's PAX Prime, the Penny-Arcade founded event that wrapped up yesterday in Seattle.

Joining the previously released cinematic teaser trailer, we now have some in-engine stills featuring the new characters that will star in the cooperative multiplayer portion of the game - which will also feature it's own set of test chambers and storyline.

Check out the rest of the images right here.

http://www.ausgamers.com/gameres/5115/images/230/Slow_Run.jpg http://www.ausgamers.com/gameres/5115/images/230/Button_Push.jpg http://www.ausgamers.com/gameres/5115/images/230/Lasers.jpg

watched some gameplay vids of co-op. its going to be awesome.