You must drive round the arena avoiding bombs.
Rotate left and right, and accelerate. To brake, release the accelerate key.
You will notice the car is quite skiddy to control.

To progress to the next arena, you must collect ten balls, and take them
each in turn to the goal, marked G.
Drive over a ball as it bounces around, and it will attach itself to the
rear of your car. You cannot carry more than one ball at a time.
Along the top of the screen is a timer bar, indicating how long you have
to return the next ball to the goal. If you don't get it back in time, 
another bomb will appear, and you will have one more ball to collect.

Do not drive into a bomb! You will lose a life, and you only have three!

Also in the arena are oil slicks and sand pits.
You will slow down when you drive through a sand pit.
You will lose a little traction as you drive through an oil slick.

There is always a bonus pickup to collect in the arena.
This appears randomly, and has four settings.
T : This will reset the current ball timer
B : This will introduce another bomb to the arena
+ : This increases the multiplier bonus
- : This decreases the multiplier bonus

You will notice half of these are good for you, and the others are bad.
If there is a bad pickup, don't despair. If you drive over the bouncing ball
while you are already carrying a ball, the pickup will randomly change to 
another type.