Bubble Bobble - Old and New - Platform: Gameboy Advance
      
Bubble Bobble New - Super mode
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Select a saved game, go to the title screen, 
then press Right, R, Left, L, Select, R, Select, L. 

Bubble Bobble Old - Super mode
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Select a saved game, go to the title screen, then press 
Left, R, Left, Select, Left, L, Left, Select. 

Bubble Bobble Old - Power-up mode
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Select a saved game, go to the title screen, then press 
Select, R, L, Left, Right, R, Select, Right. 

Bubble Bobble Old - Original mode
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Select a saved game, go to the title screen, then press 
L, R, L, R, L, R, Right, Select.