While you are 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

Select either arcade or arrange 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(2), Down(2), Up(2), Down(2).

Maniac mode

Press Left(2), Right(2), Left(2), Right(2).

Double mode

Press Up(2), Down(2), Left, Right, Left, Right.

Mirror mode

Press Left, Right, Left, Right, Left, Right, Left, Right.