Algodoo

-uploaded as an example for a contest-
Greatly improved from v2. Used to be even better but I lost all my files and had to download v2 and rebuild.
Now has a much lower and more forward center of gravity to make those hills easier. Also has insectoid feet, which provide much better traction than the tread feet did and hardly ever stick. They`re attached with paired hinges for flexibility.

ASD to run, arrow keys to walk. You have a lot of control over its orientation if you get into the air.