Valve announced Portal 2 in March 2010, and promoted it with alternate reality games including the Potato Sack, a collaboration with several independent game developers. 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. In the single-player campaign, players control Chell, who navigates the dilapidated Aperture Science Enrichment Center during its reconstruction by the supercomputer GLaDOS new characters include robot Wheatley and Aperture founder Cave Johnson. 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, 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. It was released in April 2011 for Windows, Mac OS X, Linux, PlayStation 3, and Xbox 360. Portal 2 is a puzzle-platform game developed by Valve Corporation.
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