: You can save your creations or download "Duplicates" (Dupes) made by other players through the Steam Workshop. Multiplayer and Add-ons

: Hold C to access quick options like changing your player model or physics gun color. Building and Creativity

: Use the Undo (Z) key to quickly remove the last item you spawned.

The core of GMod is building. You can start by spawning basic props and "welding" them together using the to create cars, rockets, or even complex robots.

While the single-player sandbox is great for learning, the game truly shines in multiplayer and with community mods: Guide :: Gmod: How to have fun - Steam Community

Garry's Mod (GMod) is a creative sandbox game where you can manipulate objects, build contraptions, and explore countless community-made game modes. Because it is based on the Source engine, many of its mechanics will feel familiar if you have played games like Half-Life 2 or Counter-Strike . Essential Controls

Getting comfortable with the basic keybindings is the first step to mastering the sandbox: