Directions:

Invincibility, Original Panzer Dragoon:
First find the Original Panzer Dragoon in the Appendix of Pandora's Box. Then, at the main screen press L, L, R, R, Up, Down, Left, Right.

Stage Select, Original Panzer Dragoon:
First find the Original Panzer Dragoon in the Appendix of Pandora's Box. Then, at the main screen press Up, Up, Down, Down, Left, Right, Left, Right, X, Y, White.

Wizard Mode, Original Panzer Dragoon:
First find the Original Panzer Dragoon in the Appendix of Pandora's Box. Then, at the main screen press L, R, L, R, Up, Down, Up, Down, Left, Right.

Unlock Stage Zero, Original Panzer Dragoon:
First find the Original Panzer Dragoon in the Appendix of Pandora's Box. Then, at the main screen press Up, Up, Up, Down, Down, Down, Left, Right, Left, Right, Left, Right, L, R.

Weapon Change, Original Panzer Dragoon:
First find the Original Panzer Dragoon in the Appendix of Pandora's Box. Then, at the main screen press Up, X, Right, Y, Down, White, Left, Y, Up, X.

Hard Mode Congratulations, Original Panzer Dragoon:
First find the Original Panzer Dragoon in the Appendix of Pandora's Box. Then, at the main screen press Up, Up, Down, Up, Left, Left, Right, Left, Down, Down, Up, Down, Right, Right, Left, Right.

View Hard Ending, Original Panzer Dragoon:
First find the Original Panzer Dragoon in the Appendix of Pandora's Box. Then, at the main screen press Up, Up, Down, Up, Right, Right, Left, Right, Down, Down, Up, Down, Left, Left, Right, Left.

Rolling Mode, Original Panzer Dragoon:
First find the Original Panzer Dragoon in the Appendix of Pandora's Box. Then, at the main screen press Up, Right, Down, Left, Up, Right, Down, Left, Up, Right, Down, Left, Up, Right, Down, Left.

Dragon Only Mode, Original Panzer Dragoon:
First find the Original Panzer Dragoon in the Appendix of Pandora's Box. Then first do the weapon change cheat. Next, at the main screen press Left, Left, Right, Right, Up, Down, Up, Down, L, R.