At the title screen, press Square(5), Triangle(7), Circle(3).
Pause the game and press Triangle(2), Right, Left, Right, Left, Down, Left. If you entered the code correctly, you will hear a sound. The code may be entered again to return to normal mode.
Pause the game and press Up(2), Down(3), Left, Right, Left, Right, X, Circle. If you entered the code correctly, you will hear a sound. After the game is resumed, maximum power (except for shields) will be available. Both players will be powered-up in a two-player game. Enter this code in original Parodius mode to get a shield.
After losing, allow the timer to expire, and return to the title screen. Then, choose the "Save" option at the bottom, press Start, and confirm the save. Now the current button configuration will also be saved. The same process can be used with the "Load" option to resume an old game.
When options are at maximum (four rabbits), their alignment may be changed by getting enough capsules to choose Options again.