The most famous crossword puzzle in the world may belong to the New York Times. For more than 75 years, vocabulary junkies have been grabbing the paper and a pencil and taking a stab at the grid of empty squares. Its popularity appears to be growing - partly thanks to subscriptions to an app. The company recently announced The New York Times Crossword App reached 400,000 standalone subscribers. That’s double the number it had two years ago.