Description Half-Life: Uplink is a demo version of Valve Software's 1998 first-person shooter computer game Half-Life, released on February 12, 1999. Uplink features many of the common enemies, characters, and weapons from the full game, but unlike the first HalHalf-Life: Uplink is a demo version of Valve Software's 1998 first-person shooter computer game Half-Life, released on February 12, 1999.