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  2. The Secret (treasure hunt) - Wikipedia

    en.wikipedia.org/wiki/The_Secret_(treasure_hunt)

    Clues for where the treasures were buried are provided in a puzzle book named The Secret produced by Byron Preiss and first published by Bantam in 1982. [1] The book was authored by Sean Kelly and Ted Mann and illustrated by John Jude Palencar, John Pierard, and Overton Loyd; JoEllen Trilling, Ben Asen, and Alex Jay also contributed to the book. [2]

  3. Eternity puzzle - Wikipedia

    en.wikipedia.org/wiki/Eternity_puzzle

    An empty Eternity board. The Eternity puzzle is a tiling puzzle created by Christopher Monckton and launched by the Ertl Company in June 1999. It was marketed as being practically unsolvable, with a £1 million prize on offer for whoever could solve it within four years.

  4. Eternity II puzzle - Wikipedia

    en.wikipedia.org/wiki/Eternity_II_Puzzle

    The original Eternity puzzle was a tiling puzzle with a million-pound prize, created by Monckton. Launched in June 1999, it was solved by a computer search algorithm designed by Alex Selby and Oliver Riordan, which exploited combinatorial weaknesses of the original puzzle design. [10] The prize money was paid out in full to Selby and Riordan.

  5. On the Trail of the Golden Owl - Wikipedia

    en.wikipedia.org/wiki/On_the_Trail_of_the_Golden_Owl

    He came up with the idea for the puzzle in the late 1970s, and spent 450 hours designing eleven textual riddles, which together hold the clues to a final location and a cache, hidden somewhere in France. [4] Michel Becker created eleven paintings for the book, as well as the final prize, the Golden Owl statuette. [5]

  6. 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

  7. 37 of the Best Riddles for Teens (with Answers) - AOL

    www.aol.com/37-best-riddles-teens-answers...

    Have a fun family game night with these brain twisters! The post 37 of the Best Riddles for Teens (with Answers) appeared first on Reader's Digest.

  8. This hybrid whodunit/monster-hunter mashup is centered around one central unsolved mystery, and several ancillary riddles, in the Emerald Triangle, a swath of Northern California wilderness across ...

  9. 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.