The crossword puzzle is one of the most common, frustrating, and rewarding challenges to play. A good crossword must straddle the fine line between too easy and impossible, must have good puns, a good theme, and be interesting. The most famous crossword puzzle in the world is the New York Times crossword puzzle which is edited by renowned puzzle master Will Shortz. Shortz, who also publishes sudokus and KenKens, has become something of a celebrity to those who enjoy trying the daily challenge. I attribute the lasting success of crossword puzzles to its intellectual demand while remaining very simple. Users must rely on knowledge that is drawn from all types of subjects and must use good reasoning and wordplay skills as well. The puzzles are super easy to understand, and the difficulty and overall makeup of the puzzle can drastic so much from day to day that it appeals to all types of people.