Algodoo

Uploaded for that "your best creation" contest. The course is just to showcase what it can do, but I tried to make it fun too.
This is a very old creation that has gone through numerous modifications and I`ve used it a lot, so if you`ve seen it before that was also me; this isn`t a ripoff. I did, however, build the first version after watching the mars rover showcased here: http://www.youtube.com/watch?v=BvOKWxUbbWk

CONTROLS: You can rotate the "tail" with the arrow keys. This is useful for putting it back if it gets flipped to the wrong side, the vehicle gets flipped, or if it gets stuck on a complicated obstacle.
Everything else is shown in the course as you progress. Keep an eye out for black text and red arrows.