Crossword puzzle is a popular word game. It is commonly played on a diagram of black and white squares. A set of numbered definitions or clues is usually printed near the diagram. The object is to answer the clues with words interlocking across and down the diagram. The player writes in each answer word in the row of empty squares starting at the number corresponding to the number of the clue. 
Arthur Wynne created the first modern crossword puzzle, which appeared in the Sunday New York World newspaper on Dec. 21, 1913. The puzzle became a fad in the United States and spread to other countries. Today, crosswords appear in many languages throughout the world. Puzzle championships are often held in the United States and other countries.
