Half-Life (video game)
Half-Life is a science fiction first-person shooter computer game developed by Valve Software and published by Sierra Entertainment in 1998, based on a very changed Quake game engine. It was first published for PCs running Microsoft Windows, and was later ported to Sony's PlayStation 2 video game console. A port for the Dreamcast was planned, but was cancelled. It is the first game in the Half-Life series.