Randy Pitchford, the lead designer on the game, later noted that he believed Gearbox was selected to develop Opposing Force because Valve wanted to concentrate on their future projects.
Opposing Force is the first expansion for Half-Life and was announced in April 1999.
The game was developed by Gearbox Software and Valve Corporation and published by Sierra On-Line on November 19, 1999. Half-Life: Opposing Force is an expansion pack for Valve Software's science fiction first-person shooter video game Half-Life.
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