Arthur Wynne was responsible for creating the weekly puzzle page, called Fun, for the comic section of the New York World. He had used several types of puzzles on the Fun Page and introduced the Word-cross puzzle for the 1913 Christmas edition. The puzzle was so popular that it appeared weekly in the paper and enthusiasts began sending puzzles they had created to Wynne for use in the paper.
Interestingly, the first Word-cross puzzle was diamond-shaped yet it wasn't long before it took on a rectangular layout and became known as a Crossword Puzzle.

Try the LBJ for Kids Crossword Puzzle