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Unlock the Mermaid's Cave in the Past
The Mermaid Key is a quest item from Oracle of Ages.
To obtain it, Link must give the Letter of Introduction to the Goron who manages the Goron Dancing Game in the Present. Afterwards, the Goron only agrees to give the Mermaid Key to Link if he dances in the dancing game himself, and if he does, he will receive the Mermaid Key in return for his participation. With this key, Link can unlock the Mermaid's Cave in the Past.