Bust-A-Move 4,Bust A Move 4 GameBoy Cheats Bust-A-Move 4 Game Boy Bonus characters: At the Main Menu, press Up, Down, Left, Left, Right, Up, A, B, B, A to get secret characters. Bonus levels: While 'Push Start' is flashing, press A, Left, Right, Left, A. This will open up extra levels.