Opposing Force
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Opposing Force is currently available on Steam. Launch it now* or buy it from Steam (via browser or Steam client).
*Only works if Steam has been installed, please install Steam if you haven't already.
Steam Deck support status:
Unknown - More info on ProtonDB
*Only works if Steam has been installed, please install Steam if you haven't already.
Steam Deck support status:
Unknown - More info on ProtonDB 
Return to the Black Mesa Research Facility as one of the military specialists assigned to eliminate Gordon Freeman. Experience an entirely new episode of single player action. Meet fierce alien opponents, and experiment with new weaponry. Named 'Game of the Year' by the Academy of Interactive Arts and Sciences.
Opposing Force is sometimes abbreviated "OP4".