Sandbox: Level Creation
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A Level Creation Guide for Sandbox, the base gamemode of 
Garry's Mod
For general mapping tutorials, see Category:Level Design
Getting Started
Getting started in the Hammer Editor
Map Design
Sandbox maps should be general-purpose, as you have you have no idea what the players are going to do.
Here are some features you might want to add to your map:
- Large open space for building and driving vehicles
- Tall skyboxes for flying contraptions
Warning: Do not add buildings that you can't go in, it only takes away from the experience.