20 Hard Riddles for Adults: Best Brain Teasers for Adults

Looking for incredibly challenging riddles? Try all of our tough new brain teasers that combine logic and math to test your mental mettle. No cheating!

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Hard Riddles: Math Riddles, Detective Riddles, Riddles Brain Teasers For Kids, Who Am I? (riddles game): 9781086754155: Riddles, Harry M.

Hard Riddles: Math Riddles, Detective Riddles, Riddles Brain Teasers For Kids, Who Am I? (riddles game)