Bust-A-Move 4 – Gameboy Color

Bust-A-Move 4 - Platform: Gameboy Color

Hidden characters
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Press Up, Down, Left(2), Right, Up, A, B(2), 
A at the main menu. 

Hidden levels
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Press A, Left, Right, Left, A when "Push Start" appears 
at the title screen. A game character will appear in the 
bottom right corner of the screen to confirm correct code 
entry.