The Legend of Zelda: Link's Awakening
Links goes out to find his sword and when he finds it, an owl tells him that if he wants to go back home, he must wake up the Wind Fish, the guardian of the island that sleeps in an egg at the top of the island. For this he needs the eight Instruments of the Sirens. Link explores dungeons to find these instruments. When he searches the seventh instrument, at the Ancient Ruins, he finds a texts that tells the reality about the Koholint isle: it is a dream world that only exists in the dream of the Wind Fish.