You can do whatever you want, there are no rules or objectives. Garry's Mod sandbox free play is really fun because you have plenty of freedom.
The player can also spawn any object in the game's library, as well as import external objects. You can spawn in objects, change gravity, modify physics or do many other things.
The gameplay of Garry's Mod is what is known as 'physics sandbox.' In other words, player is able to experiment on world physics, creating different objects. So, Sandbox Gmod allows lots of creativity, there are many elements that you can alter and modify. This is a physics engine and graphical editors that allow players to make maps and play them with different modes. Gmod sandbox is free download for PC, Mac, Linux now. The game was first released in 2006 but after decade of development, it has been updated with several new features.
Garry's Mod is a sandbox game originally created by Garry Newman.
