Bust-A-Move 4 Cheats (GameBoy)

At the main menu, press Up, Down, Left(2), Right, Up, A, B(2), A.

When "Push Start" appears at the title screen, press A, Left, Right, Left, A. If you
entered the code correctly, a game character will appear in the bottom right corner of
the screen.

Game Shark Codes

Note: You must have a 2.1 or higher version of the Game Shark
to use these codes in a Game Boy Color system.