Garry’s Mod is a sandbox mod for the Source Engine. Unlike normal games there aren't any predefined aims or goals. Players are given tools and are left to entertain themselves. The player is in a world where objects can be created and destroyed on demand. Where people can be created and destroyed with the click of a mouse. A world made for him. A world he made.
Wherever he goes, they follow. Boy, they must really love him!
How to get followed in Doom:
Wear green armor and a white helmet.
Profit.
The helmet is more yellowish-brown, actually.
My eyesight is failing me badly.
It happens.