{{Map Infobox
|designer=Matthew Armstrong''Opposing Force CTF'' credits (op4ctf_credits.txt)
|game=''Half-Life Opposing Force''
|mode=Capture The Flag

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


{{QuoteRefInline|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==

''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.


CategoryMultiplayer maps
CategoryHalf-Life Opposing Force