Hold down the Start button while turning on the system for a Sound Test. Note: This only works in the Japanese release of the game.
Code Effect Hold down the Start button while turning on the system. Sound Test (JP)
Contributed By: Mezmorize99.
Continuously shoot in front of the windshield at the start of any level with a jeep. Health will be restored when the jeep goes over a bump.
Contributed By: BongoGoku.
Play extra stage
Unlockable How to Unlock Tyrannosaurus stage Clear all four levels in any order without continuing.
Contributed By: SpyHunter89.
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