Portal 2 is a 2011 first-person puzzle-platform video game developed and published by Valve Corporation. It is the sequel to Portal (2007) and was released on April 19, 2011 for Microsoft Windows, Mac OS X, Linux (Linux is currently only in the beta channel of Steam), PlayStation 3, and Xbox 360. The retail versions of the game are distributed by Electronic Arts while online distribution of the Windows, OS X and Linux versions is handled by Valve's content delivery service, Steam. Portal 2 was announced on March 5, 2010, following a week-long alternate reality game based on new patches to the original game. 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.

Operating system: Windows 7 / Vista / XP

Processor: 3.0 GHz P4, Dual Core 2,0 (or higher) or AMD64X2 (or higher)

Memory: 1GB XP / 2GB Vista

Hard Disk Space: At least 7.6 GB of Space

Video: Must have 128 MB or more and should be DirectX 9-compatible with support for Pixel Shader 2.0b (ATI Radeon x800 or higher / NVIDIA GeForce 7600 or higher / Intel HD Graphics 2000 or higher)

Sound: DirectX 9.0c compatible