Half-Life: Opposing Force

Half-Life: Opposing Force is an expansion pack for the original first-person shooter Half-Life. The game setting is the same as the one in the original game: the story takes place in the science laboratory called Black Mesa Research Facility in New Mexico at the same time. However, instead of following the original characters, players are offered to assume the role of Adrien Shephard a Hazardous Environment Combat Unit (initially antagonist organization) operator, who is sent to Black Mesa to pr...