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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 published by Sierra Entertainment on November 1, 1999. Opposing Force is the first expansion for Half-Life and was first...
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Valve Corporation
Valve Corporation is an American video game development and digital distribution company based in Bellevue, Washington, USA that was founded in 1996, and made famous by its first product, Half-Life, which was released in November 1998.
Valve was...
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Gearbox Software
Gearbox Software, LLC is an American video game development company based in Plano, Texas.
Gearbox was founded in January 1999 by five members of the content team from the defunct developer Rebel Boat Rocker: Randy Pitchford, Brian Martel, Stephen...
