Garry's Mod is a sandbox physics game released on Steam by Facepunch Studios and published by Valve Corporation.With almost endless possiblities and endless gamemodes,you're sure to have fun in this fantastic game.You can play anything from "Prop Hunt",a game mode where you transform yourself into an object and hide from the Hunters using strategy and misdirection or "Hide and Seek" which is a twist on the childhood game,where's the Blues have to hide from the Reds and if they are touched,turn to the Red team.There are countless more game modes to play also. Check out Garry's Mod here:.