Garry's Mod

Garry's Mod screenshots

Garry's Mod is a Sandbox Game based around the idea of building
Gameplay Window
Garry's Mod 13.0 : Gameplay Window

Alternative downloads

Dream Cars
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Game where you play as God.
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Garry's Mod - Prop Hunt
Garry's Mod - Prop Hunt plays much like a hide and seek game.
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FREE