Slime Key
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The Slime Key is required to gain entry into the Key Cavern in Link's Awakening.
Obtaining the Key
First Link must travail to Kanalet Castle to retrieve Five Golden Leaves for King Richard. In return King Richard will grant Link access to his dangerous back garden where an owl statue is located. Using the shovel to dig under the statue, the Slime Key will appear.
The Key has a close resemblance to the Final Boss of the Key Cavern.