Along you journey with Kirby and his allies, you will come across Rainbow Puzzle Pieces (each depicting a certain scene of the Kirby Series). These type of Puzzle Pieces are found in each and every level, including the Extra Levels you will unlock with Hidden Switches (not including the Dream Palace). Some of these puzzle pieces are easier to find than others, some will actually take quite a bit of searching to find. However, in order to have 100% Completion of Story Mode, you will need to spend the extra time necessary to obtain ever last Rainbow Puzzle Piece.