A thief broke into a house but left a key behind. What kind of key was it?

Category: Mystery · Difficulty: easy

Hint: Consider something that is not a physical key.

Answer

A key to a puzzle

Explanation

The 'key' refers to a clue or piece of information essential to solving the mystery.

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

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