Half-Life 2- Episode One #6 - PC - Direct Intervention p2fbr br Half-Life is a 1998 first-person shooter (FPS) game developed by Valve and published by Sierra Studios for Windows.br It was Valve's debut product and the first game in the Half-Life series. Players assume the role of Gordon Freeman,br a scientist who must escape the Black Mesa Research Facility after it is invaded by aliens during an experiment gone wrong. br The gameplay consists of combat, exploration, and puzzle-solving.