The game's modified physics engine allows momentum to be retained through these portals, which must be used creatively to negotiate the game's challenges. Portal 2 mainly comprises a series of puzzles that must be solved by teleporting the player's character and simple objects using the 'dual portal device' (better known as portal gun), a device that can create inter-spatial portals between two flat planes. Before the game's release on Steam, the company released the Potato Sack, a second multi-week alternate reality game, involving 13 independently developed titles which culminated in a distributed computing spoof to release Portal 2 several hours early. Portal 2 was announced on March 5, 2010, following a week-long alternate reality game based on new patches to the original game.
The retail versions of the game are distributed by Electronic Arts, while digital distribution of the Windows and OS X versions is handled by Valve's content delivery service, Steam.
It is the sequel to Portal (2007) and was released on Apfor Microsoft Windows, Mac OS X, PlayStation 3, and Xbox 360. Portal 2 is a first-person puzzle-platform video game developed and published by Valve Corporation. Jonathan Coulton (Ending Theme: 'Want You Gone') Portal 2 retail cover art, featuring co-op campaign characters Atlas (bottom) and P-Body (top).
