Note: A Rapid-Fire Unit or a rapid-fire Genesis controller is needed for this trick.

On the first level, go up next to the first tree and shoot at the it for about 30 minutes (tape the button down and go read or watching some TV). When you come back, finish the level as you normally would. At the screen where you recieve your bonus points you will get so many points that it will take about ten minutes for the game to count them down!