In Car Jumping you're trying to hone the skills needed to jump your car over various obstacles and then land safely without crashing or turning over. You'll be using your mouse to work the controls on the left hand side of the screen. Click on the smiley face and move it up and down depending on what you're trying to do. You can start the car and then in mid run and jump you can turn off the throttle or put yourself in neutral so you don't crash into the wall. Every level gets a bit trickier but once you get the hang of it you'll be flying through the levels and having lots of fun in Car Jumping!