Dark Raven will bring eternal night, darkness will overcome the hearts of everyone, and the two worlds will be ruled by evil. Billy then goes and receives the Legendary Chicken Suit to begin on a journey to free the six Chicken Elders, which have been imprisoned in golden eggs by the Crows. Uri-Uri, the Chicken Elder of Pirates Island, reveals that Dark Raven is reborn every 100 years to try and bring eternal night. Once he has freed the Elders, defeated the six Crow Bosses, and opened the Rainbow Gate, Billy travels to the Giant Palace, where Dark Raven is trying to hatch the Giant Egg to receive ultimate power. Billy battles Dark Raven, and once he defeats him, the Giant Egg hatches and grants Raven's wishes, shaping him into a crow-shaped shadow demon dubbed Ultimate Raven. A second battle then ensues. Ultimate Raven attacks Billy, destroying the Chicken Suit. Afterwards, Billy must avoid his attacks until Menie-Funie speaks to him, telling him that he must not give up. Then the Courage Emblems he has collected form into the new and enhanced Sun Suit, imbued with the power of courage. Billy must then use this power to turn Ultimate Raven's attacks against him. Billy finally defeats Ultimate Raven as his heart explodes, completely ending his existence and return. The power from the Giant Egg restores true morning to the land below. Once he and his friends return to where they entered Morning Land, they return the Chicken Suits and return to their world. It seems that when they are leaving, Billy is saddened that he has to leave Morning Land. The four friends wave goodbye and they are transported back. Upon their return to the human world, Billy is a short distance away from his friends. They get his attention by laughing at him and he runs over to them joining the laughter, thus ending the game with a chicken feather slowly falling from the sky. Development Producer Yuji Naka stated in an interview with IGN that eggs were chosen as the focus of the game to give the player joy from caring for and hatching eggs, and a feeling of anticipation "because you don't know what's going to come out of eggs". Animals were incorporated into the game to convey a mood of adventure, in contrast to the digital pet-based Chao creatures highlighted in the previous project, Sonic Adventure