The Sandbox is a voxel based sandbox that allows players to easily build play and share their own 3D games.
In The Sandbox players will be able to build their own 3D voxel based game and share them for free, with no coding skills required. Terraforming the game world looks pretty similar to Minecraft, but the characters and objects you can create and use are much more detailed. Placing characters, objects and structures in your game world is as easy as dragging and dropping, and you can also create your own objects from scratch.
Obviously it looks nowhere near as fully featured as the likes of Dreams (which is now the gold standard of sandbox game building games) but it seems very easy to use, so you should be able to knock out your own 3D adventures in it pretty quickly. Sign up for the Alpha to see what you can create in The Sandbox.