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The Puzzle Adventure book series from Usborne Publishing Ltd was first created in 1984 with the release of Escape from Blood Castle. The first three volumes of the series were originally released as "Usborne Solve It Yourself". Each book contains a vividly illustrated story, with a plot-related puzzle to solve on each double page.
Of course the figures from such a book are not actually uniformly distributed (there is an excess of "0" and "1" (see Benford's Law), and sequential numbers are likely to be somewhat similar), but nevertheless they have much higher entropy density than passphrases and the like; at any rate, in practice they seem never to have been successfully ...
The key text was the Harry Potter books, but the messages were sent via a The Lord of the Rings forum to make the key text harder to identify. In Lost: Mystery of the Island, a series of four jigsaw puzzles released in 2007, a book cipher was used on each puzzle's box to hide spoilers and reveal information about the show to the fans.
In the USA the first 10,000 people who finished all 24 puzzles on May 11, 2006, and successfully registered for the final contest received a Cryptex replica with a scroll inside, containing a URL to the final puzzle (the code to open the cryptex was "GRAIL", and only the last two letters were necessary). The final puzzle was released on May 19 ...
Unlike other puzzle books, each page is involved in solving the book's riddle. Specifically, each page represents a room or space in a hypothetical house, and each room leads to other "rooms" in this "house". Part of the puzzle involves reaching the center of the house, Room #45 (page 45 in the book), and back to Room #1 in only sixteen steps.
The puzzle is studied by D. E. Knuth in an article on estimating the running time of exhaustive search procedures with backtracking. [2] Every position of the puzzle can be solved in eight moves or less. [3] The first known patented version of the puzzle was created by Frederick Alvin Schossow in 1900, and marketed as the Katzenjammer puzzle. [4]
The final portion of the book contains the answers to almost all of the clues in the book (including the cipher), and how to solve them. These last pages are sealed together, as the reader is encouraged to try to solve the puzzles themselves first. This sealed section was absent from earlier prints of the book - but was available by mail.
Example grid for a cross-figure puzzle with some answers filled in. A cross-figure (also variously called cross number puzzle or figure logic) is a puzzle similar to a crossword in structure, but with entries that consist of numbers rather than words, where individual digits are entered in the blank cells.