Garry's Mod was created by Garry Newman as a mod for Valve's Source game engine and released in December 2004, before being expanded into a standalone release that was published by Valve in November 2006. Other game modes, notably Trouble in Terrorist Town and Prop Hunt, are created by other developers as mods and are installed separately, by means such as the Steam Workshop.
The base game mode of Garry's Mod has no set objectives and provides the player with a world in which to freely manipulate objects. Garry's Mod is a 2006 sandbox game developed by Facepunch Studios and published by Valve.
