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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.

  3. Raymond Smullyan - Wikipedia

    en.wikipedia.org/wiki/Raymond_Smullyan

    The puzzle known as "the hardest logic puzzle ever" is based on these characters and themes. In his Transylvania puzzles, half of the inhabitants are insane, and believe only false things, whereas the other half are sane and believe only true things. In addition, humans always tell the truth, and vampires always lie. For example, an insane ...

  4. George Boolos - Wikipedia

    en.wikipedia.org/wiki/George_Boolos

    The Hardest Logic Puzzle Ever George Stephen Boolos ( / ˈ b uː l oʊ s / ; [ 1 ] September 4, 1940 – May 27, 1996) was an American philosopher and a mathematical logician who taught at the Massachusetts Institute of Technology .

  5. List of impossible puzzles - Wikipedia

    en.wikipedia.org/wiki/List_of_impossible_puzzles

    This is a list of puzzles that cannot be solved. 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. It is impossible to solve in half of the starting positions. [1]

  6. 10 Hard Math Problems That Even the Smartest People in the ...

    www.aol.com/10-hard-math-problems-even-150000090...

    For more puzzles and brainteasers, check out Puzzmo. More from Popular Mechanics : To Create His Geometric Artwork, M.C. Escher Had to Learn Math the Hard Way

  7. Knights and Knaves - Wikipedia

    en.wikipedia.org/wiki/Knights_and_Knaves

    One of Smullyan's examples of this type of puzzle involves three inhabitants referred to as A, B and C. The visitor asks A what type he is, but does not hear A's answer. B then says "A said that he is a knave" and C says "Don't believe B; he is lying!" [2] To solve the puzzle, note that no inhabitant can say that he is a knave. Therefore, B's ...

  8. Gokigen Naname - Wikipedia

    en.wikipedia.org/wiki/Gokigen_Naname

    A solved Gokigen Naname puzzle. Gokigen Naname, also known as Slant, [1] is a binary-determination logic puzzle published by Nikoli. [2] Rules

  9. 4 Pics 1 Word Cheats- Answering Difficult Puzzles - AOL

    www.aol.com/news/2013-02-20-4-pics-1-word-cheats...

    Occasionally, we'll rattle off four to five puzzles with little effort before getting stuck for upwards of an hour, whereupon which we eventually 4 Pics 1 Word Cheats- Answering Difficult Puzzles ...