Roblox.

Roblox is a website that you can use bricks and other objects to create an awesome world. Not made by Lego or anyone else like them, Roblox is a little different. Some worlds that other people make you cannot build in, but, have no fear, you can sell, build, create badges and more with the builders's club. It only costs 5.95 each month to have many extra features. There is also a turbo builder's club, which only costs 11.95 a month. Also, in Roblox you can change the way your avatar looks.