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Half-Life: Opposing Force

ActionPCSolo · MultiplayerBuy · from $4.99

About this game

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.

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Last checked 7 Nov 2026

Available since (your time)
Player receptionOverwhelmingly Positive95% positive · 13.6K Steam reviews ↗

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Half-Life: Opposing Force

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.

Player reception: Overwhelmingly Positive · 95% positive · 13.6K Steam reviews

Available on Steam (PC) — Buy · from $4.99, checked 7 Nov 2026.

Availability historyPast official availability changes
  • BuySteam · PC · 4 Nov 2026