"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.
Description
Under The Black Moon a opposing force mod made by TheUnbeholden Convert it to coop by AEAR 9 maps of tough goodness that will make a soldier cry for joy and or cry from the pain... Opposing Force Coop V2 By Zhouy
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Half-Life: Opposing Force
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The initial mod's author is B-dama. TheUnbeholden just reuploaded mod on ModDB.
thanks for clarification i wasnt know