"Half-Life: Opposing Force Coop" allows you to experience the epic Opposing Force story and environment with your friends, or with players around the world. Half-Life and Half-Life: Opposing Force on either WON or Steam is required to play. You must also either have an LAN or internet connection.
Opposing Force Coop v2.0
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P.S.I made the first comment!
Idiot.
you sound like a mean person be nicer
Oh! how did you do that? can you help me because i don't know any mods for half life even i will download and i don't know the next step.
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