Hidden characters 
At the title screen, select either arcade or arrange (append) 
mode. Then, hold Left and press Start for a hidden set of 
characters. To unlock a second set, hold Right and press Start. 
Note: Each mode has its own set of hidden characters.

Secret modes 
At the title screen, select either arcade or arrange (append) 
mode. Press Select or Up at the difficulty selection screen 
to display the "Secret Mode" screen. Then, enter one of the 
following codes to unlock the corresponding mode:

- Another mode -
Press Up, Up, Down, Down, Up, Up, Down, Down.

- Maniac mode - 
Press Left, Left, Right, Right, Left, Left, Right, Right.

- Double mode -
Press Up, Up, Down, Down, Left, Right, Left, Right.

- Mirror mode -
Press Left, Right, Left, Right, Left, Right, Left, Right.