Algodoo

Placed on a partly finished Martian offroad course I've been working on. It's too big for the course (intended for vehicles that fit on the flat top of the starting hill), but I thought it would be more interesting than the contest scene's size-checking box.

CONTROLS: The controls on this dune buggy are somewhat unusual due to its unique transmission setup. Left will run the motor left, Right will run the motor right, and Up will run the motor right at the maximum allowed speed. Down will brake the motor.
Hold A to disengage the rear wheel, and hold D to disengage the front wheel. You need both hands to put it to its full potential, but this setup allows you to fairly easily chose between all-wheel drive, rear-wheel drive, and front-wheel drive. In all-wheel drive (which is the default), the wheels move in lock-step, but if one wheel is totally stuck the other will still go.