Garry's Mod

Garry's Mod (abbreviated GMod) is a sandbox game developed by Facepunch Studios and published by Valve. The base game mode of Garry's Mod has no set objectives and provides the player with a world to freely manipulate objects in. The player is able to spawn NPCs, ragdolls, and props, and interact with them by various means. Other game modes, notably Trouble in Terrorist Town, are created by other developers as mods and are installed separately