Operation: Black Mesa

Experience the Half-Life™ expansion packs like never before. Operation: Black Mesa features reimaginings of both Half-Life™ Opposing Force and Half-Life™ Blue Shift through two unique campaigns. How will you survive the Black Mesa Incident? It's time to choose.
 PC

Operation: Black Mesa on Ocean of Games. Operation: Black Mesa review, release date, video, gameplay, guide, game trailer and more.