Half-Life (stylized as HλLF-LIFE) is a science fiction video game developed by Valve Corporation, the company's debut product and the first in the Half-Life series. First released in 1998 by Sierra Studios for Windows PCs, the game was also released for the PlayStation 2;[2] Mac OS X and Linux ports became available in January 2013.[3] In Half-Life, players assume the role of Dr. Gordon Freeman, a theoretical physicist who must fight his way out of a secret underground research facility whose research and experiments into teleportation technology have gone disastrously wrong.
Valve, set up by former Microsoft employees, had difficulty finding a publisher for the game, with many believing that it was too ambitious a project. Sierra On-Line eventually signed the game after expressing interest in making a 3D action game. The game had its first major public appearance at the 1997 Electronic Entertainment Expo. Designed for Windows, the game's engine, GoldSrc, was a heavily modified version of id Software's Quake game engine with code portions from the id Tech 2 engine.[1][4]
On its release, the game received universal acclaim, with critics praised the seamlessly flowing narrative, presentation and realistic gameplay, and it won over fifty PC Game of the Year awards.[5][6] Its gameplay influenced the design of first-person shooters for years after its release, and it is widely considered to be one of the greatest computer games of all time.[7][8] IGN ranked Half-Life as the number one greatest first-person shooter of all time, stating that "When you look at the history of first-person shooters, it all breaks down pretty cleanly into pre-Half-Life and post-Half-Life eras."[9] Half-Life had sold eight million copies by 16 November 2004,[10] and 9.3 million copies by December 2008.[11] By 14 July 2007, the Half-Life franchise as a whole had sold over 20 million units.[12] Half-Life was followed by the 2004 sequel Half-Life 2, which also received critical acclaim. Half-Life has had a notable cultural effect with its community mods and sequels spawning a large fanbase and cult following.

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