In a video conference interview with Tippecanoe Valley High-School (Indiana) students Valve's Gabe Newell revealed that "We just finished Portal 2. It's pretty much put to bed and we're just waiting for final approvals and to get the discs manufactured."

Portal 2 is a hilariously mind-bending adventure that challenges you to use wits over weaponry in a funhouse of diabolical science.

Using a highly experimental portal device, you'll once again face off against a lethally inventive, power-mad A.I. named GLaDOS. And this time you won't be alone. Meet an expanded cast of characters as you think your way through dangerous, never-before-seen areas of Aperture Laboratories.

Break the laws of spatial physics in ways you never thought possible, with a wider variety of portal puzzles and an expansive story that spans a single player and co-operative game mode.

The game's two-player cooperative mode features its own entirely separate campaign with a unique story, test chambers, and two new player characters. This new mode forces players to reconsider everything they thought they knew about portals. Success will require them to not just act cooperatively, but to think cooperatively.

On the PS3 Portal 2 will be supported by Steamworks, a complete suite of game features and services including auto updates, community features, downloadable content, and more.

Marking the debut of Steam functioning on any next generation console, the features shipping in the PS3 version of Portal 2 include cross platform play (PC/Mac vs. PS3) for multiplayer games, persistent cloud-based storage of PS3 saved games, and cross platform chat (PC/Mac and PS3).