 The puzzle becomes increasingly difficult throughout the week, with the easiest puzzle on Monday and the most difficult puzzle on Saturday.The larger Sunday crossword, which appears in "The New York Times Magazine", is an icon in American culture; it is typically intended to be as difficult as a Thursday puzzle.The standard daily crossword is 15 squares × 15 squares, while the Sunday crossword measures 21 squares × 21 squares (previously, 23 × 23 square Sunday puzzles were also accepted; in addition a special set of 25 × 25 Sunday puzzles, with two sets of clues—easy and hard—was published in 1999 to commemorate the upcoming millennium).