Cheats for Puzzle Bobble 4 (GBC)

Hidden levels
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.

Hidden characters
Note: This game is also titled Puzzle Bobble 4.

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