HALF-LIFE #1: THE RESONANCE CASCADE!

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Half-Life is a first-person shooter game developed by Valve and published by Sierra Studios for Microsoft Windows in 1998. It was Valve's debut product and the first game in the Half-Life series. Wikipedia
Initial release date: November 19, 1998
Series: Half-Life
Engine: GoldSrc
Developers: Valve Corporation, Captivation Digital Laboratories
Publishers: Valve Corporation, Electronic Arts, Sierra Entertainment
Final boss: Nihilanth