Chicken Mode:
At "Press Start Button" screen, hold "UP+RIGHT+X+Square", then
press "START". Enemy Attack and Defense Power will be cut to
half, also more time is allowed to complete a level.

Hard Mode:
Title screen, press "L1, R1, L2, R2, Sq, X, Tri, Cir".

Special Mode:
Finish game in less than 1:30:00. Can select Movie, SE, Sound, etc.

Flight Mode:
Finish game in less than 1:30:00, then use Player 2 control to
hold "L2+R2" and press "X". Then you use control 1 and press "X"
to activate Fly Mode. Use R2 and L2 to fly upward and downward.
Press code again to return to Jump Mode.

After you finish game(clear all stages, regardless time):
1. You can keep your newly acquired weapons and ammos, however
SAPUs (shields) are cut in half.
2. Call up the map, now you can see hidden areas on the map.