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
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