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Half-Life: Opposing Force
Half-Life: Opposing Force: multiplayer, on Linux, PC and Mac, came out 10 November 1999.
Want to play Half-Life: Opposing Force with friends?
Pick a night together in Lobbli: everyone marks when they are free, and you see which evening works.
Quick answers
Is Half-Life: Opposing Force co-op?
Half-Life: Opposing Force has multiplayer, but no co-op mode is listed for it.
How many players?
The catalogue does not list a player count yet.
Split screen?
No split screen mode is listed for it.
When did it come out?
10 November 1999.
Which platforms?
Linux, PC and Mac.
What kind of game is it?
Shooter, Platform, Puzzle
Who makes it?
Gearbox Software