Bust-A-Move 3000 Cheat Codes for Gamecube

Secret characters:
Press Y, Right, Left, Y at the "Push Start button" screen. A message will appear in the top left corner of the screen to confirm correct code entry

Another World:
Press Y, Left, Right, Y at the "Push Start button" screen. A message will appear in the top right corner of the screen to confirm correct code entry. Select puzzle mode and then arcade mode to access additional levels.