Will Shortz does not write the Times crossword himself; a wide variety of contributors submit puzzles to him. A full specification sheet listing the paper's requirements for crossword puzzle submission can be found online or by writing to the paper.
The Monday–Thursday puzzles and the Sunday puzzle always have a theme, some sort of connection between at least three long (usually Across) answers, such as a similar type of pun, letter substitution, or alteration in each entry. Another theme type is that of a quotation broken up into symmetrical portions and spread throughout the grid. For example, the February 11, 2004, puzzle by Ethan Friedman featured a theme quotation: ANY IDIOT CAN FACE / A CRISIS IT'S THIS / DAY-TO-DAY LIVING / THAT WEARS YOU OUT. (This quotation has been attributed to Anton Chekhov, but that attribution is disputed and the specific source has not been identified.) Notable dates such as holidays or anniversaries of famous events are often commemorated with an appropriately themed puzzle, although only two are routinely commemorated annually: Christmas and April Fool's Day.
The Friday and Saturday puzzles, the most difficult, are usually themeless and "wide open", with fewer black squares and more long words. The maximum word count for a themed weekday puzzle is normally 78 words, while the maximum for a themeless Friday or Saturday puzzle is 72; Sunday puzzles must contain 140 words or fewer. Given the Times's reputation as a paper for a literate, well-read, and somewhat arty audience, puzzles frequently reference works of literature, art, or classical music, as well as modern TV, movies, or other touchstones of popular culture
The puzzle follows a number of conventions, both for tradition's sake and to aid solvers in completing the crossword: