This is a big sequence in Ocarina of Time.

  1. The Cucco Lady asks adult Link to make her special blue Cucco happy. Link makes it happy by letting it wake up Talon. Then, Link takes the special Cucco to Cucco Lady's brother in Kokiri Forest.
  2. Cucco Lady's brother gives mushrooms to Link to deliver to the old woman in the potion shop in Kakariko village. The old lady makes a potion out of them, and Link returns to the forest with it.
  3. Cucco Lady's brother is no longer there, but a creepy Kokiri girl is, and she asks Link to give the potion to her. She gives Link a saw in return.
  4. The saw belongs to the Boss Carpenter in Gerudo Valley. When it's returned to him, he gives a Broken Goron Sword to Link.
  5. When Link takes the Goron sword to the giant Goron, Biggoron, on top of Death Mountain to be fixed, he asks Link to get eye drops. Biggoron gives a prescription paper to Link to give to King Zora.
  6. Depending on how far Link has progressed, King Zora may need to be unfrozen. Anyway, after Link talks to King Zora, he gives Link the ingredients to take to the old man on Lake Hylia.
  7. The old man makes the eye drops from Link's ingredients, and Link rushes them to Biggoron on Death Mountain.
  8. The Goron uses the eye drops and gives a Claim Check to Link.
  9. After three days, Link can get a Biggoron's Sword from Biggoron!