The Sunday edition of the New York Times has the crossword in the New York Times Magazine section. The Sunday crossword is larger than the standard daily crossword. The standard daily crossword is 15 by 15 squares, while the Sunday crossword is 21 by 21 squares.
The New York Times crossword puzzles are designed to be increasingly difficult through the week. Monday's puzzles are at an easy to medium level of difficulty, while Saturday's crosswords are extremely difficult. Although the crossword in the Sunday New York Times is larger, it is designed to be about as difficult as the Thursday crosswords.