There are two known methods through which to gain unlimited lives in this classic shoot-em-up. The first technique is carried out during gameplay. Hold down the HELP key and press the button on your joystick.
If this doesn't work, you may activate cheat mode by making a visit to the option screen and typing in scrap 28.
After activating cheat mode (as per above), you may use the function keys to change the speed of play, and the number keys to skip to various levels.
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