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, 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 byElectronic 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 gamebased on new patches to the original game. Before the game's release on Steam, the company released thePotato 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 's lead writer Erik Wolpaw estimates each campaign about six hours long. Portal 2 contains in-game commentary from the game developers, writers, and artists. The commentary, accessible after completing the game once, appears on node icons scattered through the chambers. According to Valve, each of the single-player and cooperative campaigns is 2 to 2.5 times as long as the campaign in Portal, with the overall game five times as long.
MINIMUM
Windows 98/2000/ME/XP
Pentium III or AMD Athlon 800MHz Processor
256MB RAM
2GB Hard Disk Space
Nvidia TNT2, GeForce 1, 2 or 3, ATI Radeon 7000, 7200, 7500 or 8500, or Matrox G450 Video Card
DirectX Compatible Sound Card
DirectX 9
MAXIMUM
Windows 7/Vista (32 or 64 bit)
Intel i7 Quad Core 2.8Ghz or AMD equivalent
3GB System RAM (High)
30 GB Hard dDisk Space
nVidia GeForce 9800 GTX / ATI Radeon HD4850 Video Card
Direct X 9.0 compatible supporting Dolby Digital Live
DirectX 9.0 - DirectX 11
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