Zelda Link's Awakening: missing key

Zelda Link's Awakening: missing key - Close Up of Leaf

In the angler's dungeon, there is one room where you need to get a key to open a door in the lower levels, but the key chest does not appear.
To make the chest appear, you have to kill all the enemies in the room, but it never appears.

The screenshot of the level where I struggle






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How do I get the last key in Key Cavern?

Place a bomb in the center of the left wall of this room to block open a new door. Go left. Take out the Bombites to find one last Small Key.

Is there an extra key in Key Cavern?

Key Cavern contains one more key than it does unlockable doors. The final Small Key in the dungeon drops from above automatically in the final room before the boss, when there is no use for it.



The Legend of Zelda: Link's Awakening ITA [Parte 1 - Isola Koholint]




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Images: Pixabay, RODNAE Productions, Renato Danyi, Ann H