There are other game modes, such as “Trouble in Terrorist Town” and “Prop Hunt”, which are created by other developers as mods and are installed separately. You’ll be given the tools and left to play as you like. The base game mode has no specific objectives, but allows you to freely manipulate different objects. Garry’s Mod or GMod (for short) is a physics sandbox game developed by Facepunch Studios and published by Valve. Best Parental Control for iPhone & iPad.IPVanish VPN vs Private Internet Access.