Stepladder
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Found only in Legend of Zelda, the Stepladder is an environment-active item, meaning it is used automatically when Link's environment allows for its use. There is no need to "equip" or "use" the item.
The Stepadder is the quest item claimed from the Fourth Labyrinth in the first quest. (Not until 6th in the second quest). It is used to traverse small (one-square) spans of water, pits, and even hot lava, which would otherwise block Link's progress.