Bust-A-Move Millennium – Gameboy Color

Bust-A-Move Millennium - Platform: Gameboy Color

Hidden levels
-------------
Press B, Left, Right, B at the main menu.

Hidden mode
-----------
Press Left, Right, B(2) at the main menu. Select puzzle mode, 
then "Wide Field". Alternately, press A(2), Down, Up at the 
main menu. Select puzzle mode, then "Normal Field". 

Bonus characters
----------------
Press B, A, B, Down at the main menu to unlock eight more 
characters.