Bonus characters
 
 Beat the game with any of the eight regular characters to unlock Zetton,
 Ace-Killer, Alien Magma, or Gomora. One of those four characters will become
 available each time the game is completed.
 
 Special gallery
 
 Unlock all four bonus characters. Then, a "Special Gallery" selection will
 appear under the "Gallery" option with graphics and information about the bonus
 characters.
 
  Game Shark Codez:
 
               
  Player 1 Codes                    
               
  Infinite Health                   
  800CEBE8 00C8
               
  Low Health                        
  800CEBE8 0001
               
  No Health                         
  800CEBE8 0000
               
  Player 2 Codes                    
               
  Infinite Health                   
  800D41D0 00C8
               
  Low Health                        
  800D41D0 0001
               
  No Health                         
  800D41D0 0000
               
  Misc Codes                        
               
  Have All Characters               
  300355C8 000B
  800355D0 0001
  800355D2 0001
  800355D4 0001
  800355D6 0001
  800355D8 0001
  800355DA 0001
  800355DC 0001
  800355DE 0001
  800355E0 0001
  800355E2 0001
  800355E4 0001
  800355E6 0001
               
  Have Secret Character             
  80035CD4 0001
  80035CD6 0001
  80035CE4 0001
  80035CE6 0001
               
  Infinite Time To Select Character 
  80048856 0019