Firstly, i would say this is not advertisement.
I just consider, IC2 forum community like science and so do I.
This 2D-nature simulator called The Powder Toy. Here is a link for this game (3mb<).
It is "pretty hard" to describe all things you can do here. The best way to do it is do it by yourself.
Leave your thoughts (and your works, if you made some) here about this small indie-game.
Some screens (not mine; credits to all authors, who are created this):
1) Realistic city, which you can destroy with your nuclear bomb:
2) Working grenade with RL mechanics:
3) Working 0,6 Hertz computer:
4) Obviously working calculator:
5) Linear Grapher:
6) P.S. Greg everywhere :
This is not even the end. Create everything!