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  2. Crossword - Wikipedia

    en.wikipedia.org/wiki/Crossword

    Crossword-like puzzles, for example Double Diamond Puzzles, appeared in the magazine St. Nicholas, published since 1873. [31] Another crossword puzzle appeared on September 14, 1890, in the Italian magazine Il Secolo Illustrato della Domenica. It was designed by Giuseppe Airoldi and titled "Per passare il tempo" ("To pass the time"). Airoldi's ...

  3. Spiral puzzle - Wikipedia

    en.wikipedia.org/wiki/Spiral_puzzle

    Spiral puzzle from the Friesland Post. A spiral puzzle is a word puzzle in the form of a spiral. The puzzle is formed of a long chain of letters, which spell out a list of clued words when read in either direction. [1] The solutions to the left are entered in the boxes from 1 to 100.

  4. The New York Times crossword - Wikipedia

    en.wikipedia.org/wiki/The_New_York_Times_crossword

    The puzzle proved popular, and Sulzberger himself authored a Times puzzle before the year was out. [11] In 1950, the crossword became a daily feature. That first daily puzzle was published without an author line, and as of 2001 the identity of the author of the first weekday Times crossword remained unknown. [13]

  5. Delay differential equation - Wikipedia

    en.wikipedia.org/wiki/Delay_differential_equation

    DDEs are also called time-delay systems, systems with aftereffect or dead-time, hereditary systems, equations with deviating argument, or differential-difference equations. They belong to the class of systems with the functional state , i.e. partial differential equations (PDEs) which are infinite dimensional, as opposed to ordinary ...

  6. Cryptic crossword - Wikipedia

    en.wikipedia.org/wiki/Cryptic_crossword

    A 15x15 lattice-style grid is common for cryptic crosswords. A cryptic crossword is a crossword puzzle in which each clue is a word puzzle. Cryptic crosswords are particularly popular in the United Kingdom, where they originated, [1] as well as Ireland, the Netherlands, and in several Commonwealth nations, including Australia, Canada, India, Kenya, Malta, New Zealand, and South Africa.

  7. 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.

  8. Missing Link (puzzle) - Wikipedia

    en.wikipedia.org/wiki/Missing_Link_(puzzle)

    Missing Link puzzle. Missing Link is a mechanical puzzle invented in 1981 by Steven P. Hanson and Jeffrey D. Breslow. The puzzle has four sides, each depicting a chain of a different color. Each side contains four tiles, except one which contains three tiles and a gap. The top and bottom rows can be rotated, and tiles can slide up or down into ...

  9. Crossword (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/Crossword_(disambiguation)

    Crossword Puzzle, an album by The Partridge Family in 1973; Crossword, an album by Helen Slater released in 2005; Crossword Quiz, a Canadian game show which aired on CBC Television 1952–1953; Crosswords DS, a 2008 video game by Nintendo; Merv Griffin's Crosswords (commonly shortened to Crosswords), an American game show