What can be locked but never unlocked, can be solved but never opened, and is often confusing?

Category: Wordplay · Difficulty: hard

Hint: Think about something that challenges your mind.

Answer

A riddle

Explanation

Riddles present a challenge that requires thought, but they can't be physically opened like a lock.

This is a hard wordplay riddle — a tricky one that takes a little thought. The answer is A riddle.

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