Portal 2 received critical acclaim for its gameplay, balanced learning curve, pacing, dark humor, writing, and acting. After release, Valve released downloadable content and a simplified map editor to allow players to create and share levels. 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 (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. A port for the Nintendo Switch was included as part of Portal: Companion Collection. 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.

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