Easy mode:
Hold Up/Right + X + Square, then press Start at the "Press Start Button"
screen. Enemy attack and defense power will be reduced by half, and more time
will be available to complete each level.
Hard mode:
Press L1, R1, L2, R2, Square, X, Triangle, Circle at the title screen. Flight
mode: Complete the game in less than 1:30:00. Hold L2 + R2 and press X on
controller two. Then, during game play, press R2 on controller one to climb, and
L2 to dive.
Bonus options:
Complete the game in less than 1:30:00. Options to play FMV sequences, sound
effects, and other selections will become available.
End game bonus:
After completing the game, regardless of time required, hidden areas will be
visible on the map. Additionally, you will retain weapons and ammunitions.
However, SAPUs will be reduced by half.
