Biggoron's Sword - The Legend of Zelda: Ocarina of Time Guide - IGN

You can obtain Biggoron's Sword as soon as you have awakened as Adult Link, rescued Epona, obtained the Hookshot or Fairy Bow, and unfrozen King Zora.

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Ocarina of Time Biggoron's Sword Trading Sequence - Zelda Dungeon

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Biggoron's Sword, Zeldapedia

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Biggoron's Sword - Zelda Wiki

Biggoron's Sword - The Legend of Zelda: Ocarina of Time Guide - IGN