In a homage to the 2011 ARG known as "foundonthetape," mu_taper is a murder map intended for 10 players, in which you roam the vents of "foundonthetape" and you and your comrades have to work together in this strange environment to thwart the murderer. 

DEPENDENCIES: 
Counter-Strike: Source 

You should have CS:S installed and mounted to Garry's Mod in order to see all textures and models.