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  2. 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. A translation in Italian was published earlier in the newspaper La Repubblica, under the title L'indovinello ...

  3. List of impossible puzzles - Wikipedia

    en.wikipedia.org/wiki/List_of_impossible_puzzles

    An impossible puzzle is a puzzle that cannot be resolved, either due to lack of sufficient information, or any number of logical impossibilities. 15 Puzzle – Slide fifteen numbered tiles into numerical order. Impossible for half of the starting positions. Five room puzzle – Cross each wall of a diagram exactly once with a continuous line.

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

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

    Media type. Paperback. ISBN. 0-8050-1088-2. 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.

  5. 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 ...

  6. Knights and Knaves - Wikipedia

    en.wikipedia.org/wiki/Knights_and_Knaves

    Since A's answer invariably would be "I'm a knight", it is not possible to determine whether A is a knight or knave from the information provided. Maurice Kraitchik presents the same puzzle in the 1953 book Mathematical Recreations , where two groups on a remote island – the Arbus and the Bosnins – either lie or tell the truth, and respond ...

  7. Notpron - Wikipedia

    en.wikipedia.org/wiki/Notpron

    Notpron (originally stylized as Not Pr0n [1]) is an online puzzle game and internet riddle created in 2004 by German game developer David Münnich. [2] It has been hailed by fans, journalists, and Münnich himself [3] as "the hardest riddle available on the internet".

  8. Zebra Puzzle - Wikipedia

    en.wikipedia.org/wiki/Zebra_Puzzle

    The Zebra Puzzle is a well-known logic puzzle. Many versions of the puzzle exist, including a version published in Life International magazine on December 17, 1962. The March 25, 1963, issue of Life contained the solution and the names of several hundred successful solvers from around the world. The puzzle is often called Einstein's Puzzle or ...

  9. Wolf, goat and cabbage problem - Wikipedia

    en.wikipedia.org/wiki/Wolf,_goat_and_cabbage_problem

    The dilemma is solved by taking the wolf (or the cabbage) over and bringing the goat back. Now he can take the cabbage (or the wolf) over, and finally return to fetch the goat. An animation of the solution. His actions in the solution are summarized in the following steps: Take the goat over. Return empty-handed.