It might have grown by enabling sexually suggestive poses of Valve's stoic game characters, but six years on there's so more to GMod than just fucking about.

Its strength is a flexibility that makes it a platform for people to make things like comics, maps, weapons, even gamemodes. It's an exercise in giving gamers tools and no direction, one of the few games that makes just messing about a core goal. His innovative physics-based mod for Half-Life 2 turned out to be a remarkably big deal, not least by being a forerunner in iterative and community focused design, and a game that's perennially in Steam's top twenty game stats.

I was just fucking about!' says Garry's Mod creator Garry Newman.