Portal 2 is a 2011 puzzle platformer video game developed by Valve for Windows, Mac OS X, Linux, PlayStation 3, and Xbox 360. The digital PC versions are distributed online by Valve’s Steam service, while all retail editions are distributed by Electronic Arts. A port for the Nintendo Switch was released as part of the Portal: Companion Collection in June 2022.

Like the original Portal (2007), players solve puzzles by placing portals and teleporting between them. 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. 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. K. Simmons). In the new cooperative mode, players solve puzzles together as robots Atlas and P-Body (both voiced by Dee Bradley Baker). Jonathan Coulton and The National produced songs for the game.