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  2. List of Martin Gardner Mathematical Games columns - Wikipedia

    en.wikipedia.org/wiki/List_of_Martin_Gardner...

    The polyhex and the polyabolo, polygonal jigsaw puzzle pieces 1967 Jul: Of sprouts and Brussels sprouts, games with a topological flavor 1967 Aug: In which a computer prints out mammoth polygonal factorials: 1967 Sep: Double acrostics, stylized Victorian ancestors of today's crossword puzzle: 1967 Oct: Problems that are built on the knight's ...

  3. Cross-figure - Wikipedia

    en.wikipedia.org/wiki/Cross-figure

    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.

  4. List of puzzle topics - Wikipedia

    en.wikipedia.org/wiki/List_of_puzzle_topics

    Computer puzzle game; Cross Sums; Crossword puzzle; Cryptic crossword; Cryptogram; Maze. Back from the klondike; Ball-in-a-maze puzzle; Mechanical puzzle. Ball-in-a-maze puzzle; Burr puzzle; Word puzzle. Acrostic; Daughter in the box; Disentanglement puzzle; Edge-matching puzzle; Egg of Columbus; Eight queens puzzle; Einstein's Puzzle; Eternity ...

  5. 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 ...

  6. Timothy Parker (puzzle designer) - Wikipedia

    en.wikipedia.org/wiki/Timothy_Parker_(puzzle...

    By early 1997, Parker’s puzzle became the "Universal Crossword" syndicated by Universal Press Syndicate to newspapers and clients worldwide. In 1999, together with Universal Press Syndicate’s Uclick division, Parker founded The Puzzle Society, and is the founder and senior editor of the Universal Uclick line of crossword puzzles and games.

  7. Software calculator - Wikipedia

    en.wikipedia.org/wiki/Software_calculator

    Formula weight calculator: The input is a chemical molecular formula, using the periodic-table symbols and notation, and there is a button to work out the percentages of its constituents. Astronomical calculator : The input is a date and one or multiple celestial bodies (usually the sun, moon, planets, planetoids or comets).

  8. Crossword abbreviations - Wikipedia

    en.wikipedia.org/wiki/Crossword_abbreviations

    Cryptic crosswords often use abbreviations to clue individual letters or short fragments of the overall solution. These include: Any conventional abbreviations found in a standard dictionary, such as:

  9. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    The first Soviet scientific pocket-sized calculator the "B3-18" was completed by the end of 1975. In 1973, Texas Instruments (TI) introduced the SR-10, (SR signifying slide rule) an algebraic entry pocket calculator using scientific notation for $150. Shortly after the SR-11 featured an added key for entering pi (π).

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