Developed and released exclusively for the PS2 version of Half-Life, it can also be played on the PC thanks to the efforts of the mod community.Īn official class-based multiplayer modification, Team Fortress Classic, was also available as a free add-on for all owners of the original retail version of Half-Life, and was included in most subsequent versions as well (e.g.
Following the doctors as they act as key scientists, their story shows the work of the Lambda scientists that Freeman co-operates with, explaining how they acted to undo the Resonance Cascade and Xen invasion. Gina Cross and Colette Green, and is the only official co-operative entry to date.
Decay follows two other Black Mesa scientists, Drs. The only expansion (presumed) to be canonical, as Barney later reappears as a significant supporting character in Half-Life 2 and its following episodes. Working to evacuate the facility following the accident, Barney's story examines the outbreak from a survivors perspective instead of combating the problem like Freeman, it's about getting out alive. Blue Shift runs concurrently with about the first third of the main plot, with the player controlling security guard Barney Calhoun. Additionally, Shephard is the only protagonist whose fate still remains completely unknown. Notably fills in what happened in Black Mesa after Freeman takes the battle to Xen. Involved in a chopper crash and separated from his squadron, Shephard awakens as the Marines begin their evacuation. Opposing Force begins shortly after the Resonance Cascade, and has the player controlling Corporal Adrian Shephard, one of numerous US Marines sent as the initial clean-up team.