What opens a door but can't be seen, only heard when it turns?

Category: Mystery · Difficulty: easy

Hint: Think about what is needed to unlock something.

Answer

A key.

Explanation

The riddle emphasizes the key's function while playing on the idea that it can be heard but not seen when used.

This is an easy mystery riddle — a good one for children and beginners. The answer is A key..

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