The following codes should be entered as
passwords on the title screen.
NOBRAKES - Full engine power.
HARDGAME - Makes the game harder.
DNUMUAHCS - Ten times more energy, but only one life.
DIEALIENDIE - All weapons on full power.
JJRULES - Thirty-five lives, all weapons on full power.
WARHEAD - Makes missiles detonate when they hit a target.
ELITEMASTER - Weapons are ten times more powerful.
PETSKUMODE - Enables reverse gear