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  2. Maze: Solve the World's Most Challenging Puzzle - Wikipedia

    en.wikipedia.org/wiki/MAZE:_Solve_the_World's...

    Maze: Solve the World's Most Challenging Puzzle (1985, Henry Holt and Company) is a puzzle book written and illustrated by Christopher Manson. The book was originally published as part of a contest to win $10,000. Unlike other puzzle books, each page is involved in solving the book's riddle.

  3. I Tried the 'Harvard Riddle'—the 'Hardest Riddle in the World ...

    www.aol.com/tried-harvard-riddle-hardest-riddle...

    What Is the 'World's Hardest Riddle' AKA the Harvard Riddle? ... Related: The Viral ‘Green Glass Door’ Riddle Is a Tough One To Solve—Can You Do It? Answers My Friends Guessed.

  4. The Hardest Logic Puzzle Ever - Wikipedia

    en.wikipedia.org/wiki/The_Hardest_Logic_Puzzle_Ever

    The Hardest Logic Puzzle Ever is a logic puzzle so called by American philosopher and logician George Boolos and published in The Harvard Review of Philosophy in 1996. [ 1 ] [ 2 ] Boolos' article includes multiple ways of solving the problem.

  5. Notpron - Wikipedia

    en.wikipedia.org/wiki/Notpron

    It has been named as "the hardest riddle available on the internet". [3] Regarded as one of the first of the online puzzle game genre, Notpron follows a standard puzzle game layout, where the player is presented with a webpage containing a riddle and must find the answer to the riddle in order to proceed to the next webpage.

  6. 120 Fascinating Unanswerable Questions That Will Astound You

    www.aol.com/lifestyle/120-fascinating...

    Trying to come up with joke answers to these deep questions can be fun, too. You might not solve the mysteries of the universe, but you'll definitely get the conversation flowing, and have a good ...

  7. The Viral ‘Green Glass Door’ Riddle Is a Tough One To Solve ...

    www.aol.com/lifestyle/viral-green-glass-door...

    The person posing the riddle then offers a series of pairs of items, only one item from each pair being able to go through the door. For example: “A sparrow can go through but a pigeon cannot. A ...

  8. List of impossible puzzles - Wikipedia

    en.wikipedia.org/wiki/List_of_impossible_puzzles

    It is impossible to solve in half of the starting positions. [1] Five room puzzle – Cross each wall of a diagram exactly once with a continuous line. [2] MU puzzle – Transform the string MI to MU according to a set of rules. [3] Mutilated chessboard problem – Place 31 dominoes of size 2×1 on a chessboard with two opposite corners removed ...

  9. 78 Riddles for Adults That Will Test Your Smarts - AOL

    www.aol.com/lifestyle/78-riddles-adults-test...

    You'll have to really stretch your brain to figure out some of these easy, funny, and hard riddles for grown-ups! The post 78 Riddles for Adults That Will Test Your Smarts appeared first on Reader ...