www.powdertoy.co.uk
So I've been hooked to this game, for like a week since I downloaded it. It's basically a simulation game, where you get a big open sandbox and materials. Materials like water, lava, powder, sand, dust, earth, yeast, gas, snow, ice, fire, metals, etc, but also more unusual things like nitrogen, rubidium, sub-zero flame, acid, tesla coil, battery, insulator, electrons, electricity, wiring, photons, etc.
Now, with this empty sandbox and a catalog of materials, you can build and make whatever you want. Whether you create a bustling city with scenic views and stickman people, only to raze it to the ground with a homemade nuke; or creating photon lazers; putting together homemade weapons of mass destruction; building nuclear reactors and fusers; watching life forms grow and expand; alternatively, watching those life forms being eaten away by a nasty virus; creating realistic models of the Human body; it's all up to you.
And if you don't know how to do all of that (it's kind of confusing when you first start it, mainly because there are so many materials) you can load up other people's works and have fun with them.
The game is free. And lawls, I didn't mean to sound like an advertisement, it's just that this game is awesome.
