Half-Life is a science fiction first-person shooter video game developed by Valve Corporation, the company's debut product and the first in the Half-Life series. First released by Sierra Studios, the game was also released for the PlayStation 2. 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 uses a heavily modified version of the Quake engine called GoldSrc.
On its release, critics hailed its overall presentation and numerous scripted sequences, and it won over 50 PC Game of the Year awards. 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. As of 16 November 2004, Half-Life sold eight million copies, and 9.3 million copies by December 2008. As of 14 July 2006, the Half-Life franchise has sold over 20 million units. Half-Life was followed by the 2004 sequel Half-Life 2, which also received critical acclaim. Half-Life has had a notable cultural impact with its community mods and sequels spawning a large fanbase and cult following.