"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.
MINIMICUS a Half-Life Mod Made by someone named Petrick. Story : The scientists at Black Mesa have invented a shrinking machine. They are shrinking Xen creatures in order to make them easier to control. Two shrunken Gonarchs have escaped and are breeding in the civilian community. The Marines have once again been called in to ‘contain’ the problem and eliminate any witnesses. Opposing Force Coop V2 Mod By Zhouy Convert it to coop by AEAR