This subject is related to a real world perspective.
This subject is related to the Black Mesa Incident era.


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The subject matter of this article does not take place in the "real" Half-Life and Portal universe and is considered non-canon.

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Matthew Armstrong[1]


Half-Life: Opposing Force

Game mode(s)

Capture The Flag

Power-Up spawns




HairBall is a map in the multiplayer mode of Half-Life: Opposing Force. It was added in the Opposing Force CTF update.



“About once every 75 years, the temperature in the peaks over the Black Mesa facility drops to below freezing. A battle rages between the military and civilians. Supplies run low, and two smaller sorties are are cut off from the main conflict and find themselves in a small scale intense battle for control of the supply bunkers.”
Opposing Force CTF Description

Behind the scenes[edit]

HairBall was originally created simply for demonstration purposes by designer Matthew Armstrong, but the level caught on and was eventually developed into a full-fledged map.[1]


  1. 1.0 1.1 Opposing Force CTF credits (op4ctf_credits.txt)