The Level In this level, you have to fire a small ball into a pit. All you have to do is set some rotation limits on the rotating joint, and try it out. Then focus the camera on the ball, throw it again, and you've earned your check. * One strategie to use would be rotation limits. If you want to make a tank, with a movable gun, but dont want the gun shooting the driver, rotation limits are the thing to use. * Also, if you want to make a drivng challenge, and want to have your robot always in the field of vision, focus the camera on your car.