There is no penalty for falling onto a solid surface, but falling into bottomless pits or toxic pools kills the player character immediately.

Characters can withstand limited damage but will die after sustained injury. These three characters can explore and interact with the environment.

The player takes the role of Chell in the single-player campaign, as one of two robots-Atlas and P-Body-in the cooperative campaign, or as a simplistic humanoid icon in community-developed puzzles. Portal 2 is a first-person perspective puzzle game. Jonathan Coulton and the National produced songs for the game. In the new cooperative mode, players solve puzzles together as robots Atlas and P-Body (both voiced by Dee Bradley Baker). In the single-player campaign, players control Chell, who navigates the dilapidated Aperture Science Enrichment Center during its reconstruction by the supercomputer GLaDOS (Ellen McLain) new characters include robot Wheatley (Stephen Merchant) and Aperture founder Cave Johnson (J. Portal 2 adds features including tractor beams, lasers, light bridges, and paint-like gels that alter player movement or allow portals to be placed on any surface. Like the original Portal (2007), players solve puzzles by placing portals and teleporting between them. The digital PC version is distributed online by Valve’s Steam service, while all retail editions were distributed by Electronic Arts. Portal 2 is a 2011 puzzle-platform video game developed by Valve for Windows, Mac OS X, Linux, PlayStation 3, and Xbox 360. Editing Tools: Portal 2 editing tools will be included.Massive sequel: The original Portal was named 2007’s Game of the Year by over 30 publications worldwide.Advanced physics: Allows for the creation of a whole new range of interesting challenges, producing a much larger but not harder game.Complete two-person co-op: Multiplayer game featuring its own dedicated story, characters, and gameplay.Extensive single player: Featuring next generation gameplay and a wildly-engrossing story.Success will require them to not just act cooperatively, but to think cooperatively. This new mode forces players to reconsider everything they thought they knew about portals. The game’s two-player cooperative mode features its own entirely separate campaign with a unique story, test chambers, and two new player characters.

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