UemeU (You-Me-You) is a unique sandbox that allows users to play and create games, build virtual worlds and make stunning 3D art. You can build privately in your own world, or explore and collaborate in shared environments with players from around the globe. With an ever-growing library of shapes, colours, materials and gadgets along with an easy-to-use interface, UemeU will appeal to both gamers and designers alike. For more information please visit www.uemeu.com. --- To activate the game, press "Play Game" and "Get Keys". Then, register at uemeu.com/#/user/register, go to Account --> My Licences and paste your license key, press "Claim License".
I just got this a few days ago and am really impressed with it. The main reasons that I gave it a 10 rating are these:
1) Easy to learn, yet powerful in what it can do.
I have used a number of world builders dating all the way back to trying to create Doom and Heretic wads. Recently, I have also used Gary's Mod, Patterns and others. I have never used one that I felt was this easy, and yet powerful, to use.
2) Tutorial and help system is also very clearly laid out with instructions and examples that even someone like me can understand. :)
3) You can easily flip between building and playing so you can see the results of what you did right away. That's especially nice for those times when you aren't 100% sure what you want to do or how an option will affect what you are working on.
4) And, of course, it looks really good.
This is a work in progress, but it does say "Alpha Release" so no problem there.
If you are feeling creative, I would definitely give it a try.