Debug mode
 
 At the title screen, press Down, Up, Down, Up, Right, Down, Left,
 Down, Up, Down.
 
 Level skip
 
 Enter debug mode. Then while playing a game, press L1 to skip to the
 previous level or press R1 to skip to the next level.
 
 Debug menu
 
 Enter debug mode. Then while playing a game, press R2 to display the
 debug menu, and press R1 to hide the debug menu. This displays the
 map number, Bub's lives, and Bob's lives.
 
 Original version
 
 At the title screen, press Right, Left, Up, Down, Up, Down, Up. Now
 the original version of the game allows you to enter the diamond
 rooms at levels 20, 30 and 40 even if you lose a life.
 
 Alternate bonus effects
 
 Enter one of the following initials on the high score screen, then
 start another game. The new effects will appear when certain bonuses
 are collected during the game:
 
 SEX
 
 TAK
 
 STR
 
 KTT
 
 I.F
 
 MTJ
 
 NSO
 
 KIM
 
 YSH
 
 LSD
 
  Game Shark Codez:
 
               
  Infinite Lives P1                
  80176AC8 0005
  80176ACC 0100
  30176AE0 0000
               
  Infinite Lives P2                
  80176A98 0003
  80176A9C 0100
  30176AB0 0000
               
  Infinite Credits                 
  80176B30 0009
               
  P1 Special of The Bobble         
  80176ACE 0129
               
  P1 Special of The Bobble in Fire 
  80176ACE 011F
               
  P2 Special of The Bobble         
  80176A9E 0129
               
  P2 Special of The Bobble in Fire 
  80176A9E 011F
               
  Rainbow Islands                  
               
  Infinite Lives P1                
  8005DC3A 0003
               
  Infinite Credits                 
  8005D3E6 0009