Half-Life: Opposing Force Coop Mod

doors etc, changed so you get all weapons from previous level automatically, made so you can't hurt your teammates, allowed monsters on levels, made monsters harder and stronger etc. [*] [b]Requirements:[/b] [u][b]Half-Life and Half-Life: Opposing Force is required to play. This mod will not work on regular Half-Life.[/u][/b]
The title "Opposing Force Coop" says it all. It allows you to play cooperative with others through LAN or internet. For best support, the creator of this mod added more spawnpoints, removed blocking