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  2. 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.

  3. 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

  4. Lists of unsolved problems - Wikipedia

    en.wikipedia.org/wiki/Lists_of_unsolved_problems

    List of unsolved problems may refer to several notable conjectures or open problems in various academic fields: Natural sciences, engineering and medicine

  5. Mystery Case Files - Wikipedia

    en.wikipedia.org/wiki/Mystery_Case_Files

    Mystery Case Files: Escape From Ravenhearst is the eighth installment of the Mystery Case Files franchise and was released in November 2011 as a Collector's Edition. Some residents in Blackpool, England have gone missing around Ravenhearst Manor and the player, the Master Detective must return to the fire-ravaged manor and search for the ...

  6. Eternity puzzle - Wikipedia

    en.wikipedia.org/wiki/Eternity_puzzle

    As soon as the puzzle was launched, an online community emerged devoted to solving it, centred on a mailing list [4] on which many ideas and techniques were discussed. It was soon realised that it was trivial to fill the board almost completely, to an "end-game position" where an irregularly-shaped void had to be filled with only a few pieces, at which point the pieces left would be the "wrong ...

  7. Category:Unsolvable puzzles - Wikipedia

    en.wikipedia.org/wiki/Category:Unsolvable_puzzles

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

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