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(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. 
 
 
 Game Shark Codez: 
 
 Allows Game to Play in a Mod-Chip System:
 D001E160 FFF2
 8001E160 0001
 D01B6F20 0003
 801B6F20 0001
 D01B76A8 DE07
 801B76A8 DDFE
 D004B4C0 0920
 8004B4C0 0900
 D01B6A68 0920
 801B6A68 0900
 D01B6BF0 0920
 801B6BF0 0900
 D01B6414 6424
 800101DA 0101