The player character is sent in to neutralize the Black Mesa Research Facility when a scientific mishap causes it to be invaded by aliens, but quickly finds that the Marines are outnumbered and slowly being beaten back by a second alien race and black operations units. Opposing Force returns to the same setting as Half-Life, but instead portrays the events from the perspective of a US marine, one of the enemy characters in the original game. Opposing Force is the first expansion for Half-Life and was first announced in April 1999. The game was developed by Gear and Valve corporation and published by Sierra on November 19, 1999. ![]() ![]() Half-Life: Opposing Force is an expansion pack for valve's science fiction FPS Half Life. Half-Life: Opposing Force Home > Browse Our Collection > Software > PC Windows 32 Bit > Half-Life: Opposing Force
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