At the Title screen hold A B C then release C then B then A. Now press B A B Y hold X press Up hold Down release X and release Down.
At the Title screen hold C B A Up L then release A then C then L then Up then B. While playing hold A B C Up L to move ahead a level. Hold X Y Z Up L to move back a level.
At the Press Start screen press Up Up Up A Z A Down Down Down.
Refuel and Reload
At the Title screen press L A Z Y A Down Down. While playing pause the game to reload and refuel.