Half-Life (1998) [PC] Full Game

Half-Life is a 1998 first-person shooter game developed by Valve Corporation and published by Sierra Studios for Microsoft Windows. It was Valve's debut product and the first game in the Half-Life series. The player assumes the role of Gordon Freeman, a scientist who must escape from the Black Mesa Research Facility after it is overrun by alien creatures following a disastrous scientific experiment. The gameplay consists of combat, exploration and puzzles.