Codes for Original Panzer Dragoon:
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