The Slime Eel is the boss of the Catfish's Maw in Link's Awakening. It is a giant eel-like monster that opposes Link in an attempt to prevent him from waking the Wind Fish.
As the battle starts, the Slime Eel will create a large hole in the ground and four smaller holes in the walls of the chamber. Its tail will then spin around continuously from the hole in the ground, which Link must avoid at all costs. Link must wait until its head pops out of one of the walls and use the Hookshot to pull it out into the open. Once revealed, an exposed heart will appear on its body which Link must strike with his sword. The further Link is from the Slime Eel when it is pulled out, the longer it will take for it to retreat back into the hole. Sometimes, Link will pull out a fake eel that will explode. Before the Slime Eel's destruction at the hands of Link, it states that Link does not know what kind of island Koholint Island is, which appears to amuse it.
Defeating the Slime Eel gets Link the Wind Marimba as well as a Heart Container.
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The Slime Eel in Link's Awakening
Link exposes the Slime Eel's heart