Half-Life 2

Half-Life 2 is a first-person shooter computer game and the highly anticipated sequel to Half-Life, developed by Valve Software. It was released on November 16, 2004 to very positive reviews {{ref|reviews}}, following a protracted five-year development cycle during which the game's source code was leaked to the internet. The game utilizes the advanced Source game engine, coupled with a heavily modified version of the Havok physics engine, and was critically acclaimed for ground-breaking improvements in computer animation, computer graphics, artificial intelligence (AI) and physics. Since its release, the game has sold about 3 million copies so far {{ref|sales}}.

References

• {{Note|reviews}} {{Web reference | URL = http://www.gametab.com/pc/half-life.2/1449/ | title = Half-Life 2 reviews for the PC | work = GameTab | date = June 5 | year = 2005}}
• {{Note|sales}} {{Web reference | URL = http://arstechnica.com/articles/culture/lostcoast.ars/4 | title = A primer on HDR and a tour of Valve's Lost Coast | work = Arstechnica.com | date = September 16 | year = 2005}}
• {{Note|raisebar}} {{Book reference | Author = Hodgson, David | Year = 2004 | Title = Half-Life 2: Raising the Bar | Publisher = Prima Games | ID = ISBN 0761543643 }}