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  2. List of ciphertexts - Wikipedia

    en.wikipedia.org/wiki/List_of_ciphertexts

    Unsolved [2] 1990 Kryptos: Partially solved (3 out of the 4 ciphertexts solved between 1992 and 1999) 1991 Scorpion ciphers [3] Unsolved 1999 Ricky McCormick's encrypted notes: Unsolved 2006 Smithy code, embedded within the 2006 judgment on The Da Vinci Code case Solved within month of publication 2012–2016 Cicada 3301 puzzles

  3. Millennium Prize Problems - Wikipedia

    en.wikipedia.org/wiki/Millennium_Prize_Problems

    The other six Millennium Prize Problems remain unsolved, despite a large number of unsatisfactory proofs by both amateur and professional mathematicians. Andrew Wiles , as part of the Clay Institute's scientific advisory board, hoped that the choice of US$ 1 million prize money would popularize, among general audiences, both the selected ...

  4. Cicada 3301 - Wikipedia

    en.wikipedia.org/wiki/Cicada_3301

    The first puzzle started on January 4, 2012, [1] on 4chan [2] and ran for nearly a month. A second round of puzzles began one year later on January 4, 2013, and then a third round following the confirmation of a fresh clue posted on Twitter on January 4, 2014. [3] [4] The third puzzle remains unsolved. The stated intent was to recruit ...

  5. This Puzzle That Gives You the Chance to Win $1 Million ... - AOL

    www.aol.com/puzzle-gives-chance-win-1-215500665.html

    These are the best puzzles for adults and families, including top-rated and best-selling jigsaw puzzles and 3D puzzles from Ravensburger, Galison and Amazon.

  6. 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. Kookrooster maken 23; 15 Puzzle – Slide fifteen numbered tiles into numerical order. It is impossible to solve in half of the starting positions.

  7. Category:Unsolvable puzzles - Wikipedia

    en.wikipedia.org/wiki/Category:Unsolvable_puzzles

    Pages in category "Unsolvable puzzles" The following 13 pages are in this category, out of 13 total. ... Five-room puzzle; M. MU puzzle; Mutilated chessboard problem; S.

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