Select either arcade or arrange mode. Then, 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. Information in this section was contributed 
by Chys Chia. 

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.