Fan remake
Operation: Black Mesa
by Tripmine Studios · 2009 · Shooter
Source remake of the Opposing Force and Blue Shift expansions, including Guard Duty.
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.
Built upon Half-Life (1998).