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.

Free map movement:
Press Start during game play to display the options menu. Enter the "Map" option. Press Select to stop the map movement. Press L1, L2, R1, R2, and the D-pad to move around the map.

Level skip:
Load a saved game and repeatedly tap Start until the save game message appears. Select "No" to continue game play at the next level.

In-game reset:
Press L1 + L2 + R1+ R2 +Select during game play.

Bonus options:
Use a memory card and complete the game in less than 1:30:00. Press Start after the title screen appears again. Choose the "Special" selection on the screen to access level selection, view FMV sequences, enter sound test mode, and other options.

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.