Hold L+R on Controller 2, hold Select and press start on Controller 1, then change the number of ships.
5/14/2002
Safe Spot
As soon as the first stage begins, fly to the top of the screen and stay above the last three digits of the high score. No enemies will hit you.
5/14/2002
No Enemy Demo
Play the game and top the high score of 100,000 points. Then enter the initals ZTT when you can after the game is over. When the demo runs, no enemies will be there in the action scene.