Use the left and right arrow keys to steer the car, and up and down to move forward and backward. Hold z to brake, making you move slower. You move backwards slower, and the grass slows you down as well. Press space to switch tracks. When you touch the finish line, it will tell you your time and reset the timer.
This is based on a demo project called "Marble Racer" in Scratch 1.4. I found it recently and refurbished it, creating a different control scheme and vehicle.
