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Accelerate and decelerate forward and backward and side to side using the arrow keys. Thanks to nic for the idea of changing colors. You can switch between the color mode and normal white mode using the "a" key. I implement this in my texture cube scenario here: http://www.greenfoot.org/scenarios/5944. You may use the code as long as you like the scenario and give me credit in your game.
Suggestions, as always, are welcome.