Is Half-Life: Opposing Force co-op?

Half-Life: Opposing Force does not list co-op on Steam; it has Online multiplayer, Single-player too.

Does Half-Life: Opposing Force have PvP?

Steam does not list PvP for Half-Life: Opposing Force.

How many people play Half-Life: Opposing Force?

About 74 players were in-game when this page was built (2026-09-08).

Ready Up — what game do we play?Compare two Steam libraries →

Multiplayer games › Shooter › Sci-fi shooter

Is Half-Life: Opposing Force multiplayer or co-op?

Yes — online multiplayer. Half-Life: Opposing Force is a sci-fi shooter game released in 1999, 95% positive on Steam (25,561 reviews), with 74 playing right now. $4.99 on Steam.

Online multiplayerSingle-player tooShooter · Sci-fi shooter

Return to the Black Mesa Research Facility as one of the military specialists assigned to eliminate Gordon Freeman. Experience an entirely new episode of…

Steam tags: FPS, Action, Classic, Sci-fi, Singleplayer, Shooter, First-Person, Aliens

Do you and a friend both own Half-Life: Opposing Force?

Ready Up compares two Steam libraries and shows every multiplayer game you both have — including whether Half-Life: Opposing Force is one of them — then helps you pick tonight's game with a weighted roll or a bracket.

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Games like Half-Life: Opposing Force you can play together

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Halo Infinite

Sci-fi shooter · 70% positive on Steam (177,041 reviews) · 2,275 playing right now

Half-Life 2

Sci-fi shooter · 98% positive on Steam (245,627 reviews) · 1,555 playing right now

Black Mesa

Sci-fi shooter · 95% positive on Steam (127,693 reviews) · 907 playing right now

Half-Life

Sci-fi shooter · 97% positive on Steam (148,221 reviews) · 634 playing right now

Tired of Half-Life: Opposing Force? The Swap tab finds the closest unowned games of the same type that are newer or rated higher.

Quick answers

Is Half-Life: Opposing Force co-op?: Half-Life: Opposing Force does not list co-op on Steam; it has Online multiplayer, Single-player too.
Does Half-Life: Opposing Force have PvP?: Steam does not list PvP for Half-Life: Opposing Force.
How many people play Half-Life: Opposing Force?: About 74 players were in-game when this page was built (2026-09-08).

Ready Up is a free tool: enter two Steam usernames and it lists the multiplayer games you both own, runs a bracket to pick one, and suggests new co-op games that fit how you both play. Ratings, tags and player counts from Steam and SteamSpy; updated 2026-09-08. Powered by Steam — not affiliated with or endorsed by Valve Corporation.