mental_floss teams up with puzzle aficionado Matt Gaffney to bring solvers one of the most amazing crossword collections ever devised. Each of the 66 puzzles not only features a fun theme and witty clues, there's also a secret puzzle within the puzzle waiting to be solved. This is called a meta-puzzle in the biz, and Gaffney has pulled out all the stops to keep your mental wheels turning.
Matt Gaffney has been a professional crossword puzzle writer for the past 15 years. His puzzles have appeared in Billboard, the Chicago Tribune, the New York Times, and many other publications. He's written eight books of crossword puzzles, four books of variety puzzles, and the 2006 narrative book Gridlock: Crossword Puzzles and the Mad Geniuses Who Create Them. He's also the author of the Complete Idiot's Guide to Crossword Puzzles & Word Games. Gaffney lives in Staunton, VA.