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Run. Think. Shoot. Live.
Half-Life tagline[src]

Half-Life, stylized as HλLF-LIFE, is a science fiction first-person shooter developed by Valve and published by Sierra Entertainment. It was first released by Sierra Studios on November 19, 1998.

The player takes the perspective of scientist Gordon Freeman. Designed for Microsoft Windows, the game uses a heavily modified version of the Quake engine, called GoldSrc.

There are several mods based on Half-Life, including Counter-Strike. Although it later became a stand-alone game, the Counter-Strike GoldSrc games require Half-Life files and automatically downloads them during installation.

See also

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