Unlock the original Panzer Dragoon found in the appendix of Pandora's 
Box then enter a code below

Get Stage Zero
Go to the title screen of Panzer Dragoon original and 
press UP, UP, UP, DOWN, DOWN, DOWN, LEFT, RIGHT, 
LEFT, RIGHT, LEFT, RIGHT, L, R. Now you MUST shoot 
enemies to get health back.


Get Invincibility
Go to the title screen of Panzer Dragoon original and 
press L, L, R, R, UP, DOWN, LEFT, RIGHT.


Unlock Levels
Go to the title screen of Panzer Dragoon original and 
press UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, X, Y, WHITE.


Get 2X Mode
Go to the title screen of Panzer Dragoon original and
press L, R, L, R, UP, DOWN, UP, DOWN, LEFT, RIGHT. 
This allows you to play at 2X speed in wizard mode.


Pandora's Box options
Accumulate twenty hours of game play to unlock most of the 
Pandora's Box Appendix options, including the Panzer Dragoon game.


Flight Records option
Successfully complete the game under any difficulty setting or 
accumulate five hours of game play. 


White Dragonmare
Unlock the Dragonmare in Box mode. Highlight the Dragon Select option, 
then hold White and press Start . Release White when the game starts.


Hint: Unlock Original Panzer
To get the original Panzer Dragoon game, complete the entire game or 
play for five hours straight. Then go to the appendix section and select 
the original game!

Hint: Weapon Change In Original Game
Run the original game after you have unlocked it, then hit up, X, right, Y, 
down, white, left, Y, up, X.

Hint: Unlock Levels In Original
After unlocking the original Panzer game, hit the following buttons from its 
main menu: up, up, down, down, left, right, left, right, X, Y, white.

Hint: Unlock Everything
After you have played for 20 hours, the entire Pandora's Box will be 
available.

Hint: Unlock Original Stage Zero
After unlocking the original Panzer Dragoon game, you can then access 
stage zero. To do this, go to the main menu of the original game and hit 
the following buttons: up, up, up, down, down, down, left, right, left, right, 
left, right, L, R.

Hint: Unlock Wizard Mode In Original
After you have unlocked the original game, hit the following buttons from 
the main menu: L, R, L, R, up, down, up, down, left, right.