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There s been an incident at a government lab, some God-forsaken place called Black Mesa. It is imperative to National Security that no one learns what has happened there. You and your squad must infiltrate the lab, eliminate the hostiles, neutralize all resistance and secure the facility. This is no cakewalk. You ll have to rely on your training and trust your fellow soldiers if you want to survive this mission. No one knows what you ll find there, but expect the worst. So pack your gear, the chopper leaves in 15 minutes. In addition to its exciting new single-player experience, Opposing Force features a large collection of fresh multiplayer content, including new weapons, player characters and 15 new multiplayer maps.