When the New York Times declares these puzzles among their hardest, you know they mean business! But never fear—even if you don't know what type of money they use in Mauritius or what a female hamster is called, some of the other clues in these 50 intriguing puzzles will undoubtedly play to your strengths. The founder of both the American Crossword Puzzle Tournament and the World Puzzle Championship, Will Shortz is an internationally renowned puzzle master. He has been the crossword puzzle editor of the New York Times for 30 years, and the puzzle master for Weekend Edition Sunday on National Public Radio.