Features single and multiplayer co-op modes. The single-player portion of Portal 2 introduces a cast of dynamic new characters, a host of fresh puzzle elements, and a much larger set of devious test chambers. Players will explore never-before-seen areas of the Aperture Science Labs and be reunited with GLaDOS, the occasionally murderous computer companion who guided them through the original game. 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).

In addition, those who purchase Portal 2 for the PlayStation 3 may unlock a Steam Play (PC & Mac) copy of Portal 2 at no additional cost by linking their PSN and Steam accounts.