human
How do I build a sandbox?
assistant
Build a Sandbox
1.  Start with an empty folder in your computer.
2.  Download and install the Unity game engine from https://unity3d.com/unity/.
3.  Download the free version of Blender at http://www.blender.org/.
4.  Download the free version of Unreal Engine 4 at https://www.unrealengine.com/en-US/free.