Garryho Mod -

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

: Use Left Click to grab and move objects. Right Click freezes them in place, and holding E while moving the mouse allows you to rotate the object. Garryho mod

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. : Hold C to access quick options like

: Use WASD to move, Space to jump, and Shift to sprint. The core of GMod is building

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

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

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