What sort of key opens doors without a lock, yet can easily unlock a locked room?
A donkey
A monkey wrench is a tool (wrench) named after an animal, used to turn hardware.
About this riddle
Wordplay riddles depend on how words look and sound. Watch for double meanings, hidden words and letters you can move or remove.
Difficulty: Medium. More like this: Wordplay riddles with answers or try Anagrid for a different kind of puzzle.
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