Algodoo

E and F to control the head, M for first lock, N for second lock, L for third lock.
W and S to go forwards and back, Z to brake.
V allows a little bit more movement.
; releases the break, X and C move the stone hatch to deploy the fluid.

A weak example of a rover on mars, one of my first Algodoo builds. Feel free to change the terrain, but please do not re-upload without permission. Thanks.