"Difficult Riddles"
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Piotr's Logic Riddles - This is a collection of semi-mathematical riddles that are based in logic rather than tricks or jokes. Think about these for a while before seeking the answer. And make sure you have a pencil and scrach paper handy.
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Seemingly Unsolvable Riddles - Two riddles that don't seem to have an answer. Can you figure them out?
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The Troublesome GRY Riddle - This riddle has been around for several decades and has been passed from perplexed person to perplexed person. However, the version that has been passed around is incorrect! Try to solve the incorrect version, then see how easy it is with the real one.
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The Ultimate Puzzle Site: Harder Riddles - Give yourself some time to crack these 17 logic riddles. Get ready to think hard.
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William Wu's Collection of Relatively Hard Riddles - What a great, large collection of difficult riddles! Check the codes at the top of the page, because some of these require advanced knowledge of math or the use of a computer. (Note: If you don't see the first riddle right away, you might have to scroll down the page just a little bit.)
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