Half-Life: Opposing Force

Half-Life: Opposing Force is an expansion pack for Valve Software's science fiction first-person shooter video game Half-Life. The game was developed by Gearbox Software and Valve Corporation and published by Sierra Entertainment on November 1, 1999. Opposing Force is the first expansion for Half-Life and was first announced in April 1999. Randy Pitchford, the lead designer on the game, later noted that he believed Gearbox was selected to develop... More

Video Games

Part of game series

Half-Life series

The Half-Life series of video games share a science fiction alternate history. Nearly all of the games are first-person shooters on the GoldSource or Source engines, and most are linear, narrative, single-player titles. Valve Corporation is the developer, and partly the publisher and distributor,...

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