Released in November 1999, is the first official expansion pack for the seminal first-person shooter Half-Life . Developed by Gearbox Software rather than Valve, the game provides a "perspective inversion," placing you in the boots of the enemies from the original game. Plot & Setting
For many fans, Opposing Force is even better than the original Half-Life due to its darker tone and military grit. That is why the demand for a clean, portable file remains high. half life opposing force zip