For the first time, you can lead AI-controlled teammates. Recruit Medics to heal you, Engineers to torch through locked doors, and Grunts for extra firepower.

Experience the Black Mesa Incident from the Other Side: Half-Life: Opposing Force

You play as , a member of the Hazardous Environment Combat Unit (HECU). Your mission is simple: enter Black Mesa, eliminate the alien threat, and silence any witnesses—including Gordon Freeman. However, your transport is shot down, leaving you stranded behind enemy lines. Now, you must cooperate with fellow soldiers and even your former "targets" to survive the encroaching alien invasion from Race X. New Features & Gameplay

Opposing Force isn't just a mission pack; it introduces significant mechanics that evolved the Half-Life formula:

Even decades later, Opposing Force is praised by reviewers at sites like Force For Good as a "highly competent second helping" of the Half-Life universe. It adds depth to the lore of Black Mesa and provides some of the most challenging combat encounters in the GoldSrc engine. How to Play