Actually, Garry’s Mod allows you to do literally anything. Then you are welcome to share it online and play it with your buddies on one of the servers (there are thousands of them here). It is called Mod for a reason – you can enter the sandbox and create any game mode on your own.
These are the games where you can literally do anything you may want. What makes Garry’s Mod that popular? First of all, it is the complete freedom of actions this franchise provides.
