Cross-platform co-op between PS3 and PC/Mac planned for Portal 2

Valve's Portal 2 presentation at E3 was packed full of gameplay videos showing off new features and an intriguing story line. While co-op gameplay wasn't shown, Valve developer Erik Johnson did reveal one new bit of info. Valve is planning to allow PS3 players play with PC/Mac players.

When questioned on the cross-compatibility between Steamworks and Steam, specifically playing co-op on a computer with someone on a PS3, he said it was "something the team is gunning for." We also confirmed with Valve developer Mike Dunkle who said "The plan is you will be able to play between console and PC."