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.
David, follow the red lights to freedom!
Looks way better in view original.
Suddenly, a hole appears and pow, dead.
And then he respawns.
Flesh eating fireflies?
no it's lights to glide David into levels. if u want to know more play this mod for half-lief 1: Moddb.com and no it is not for half-life source