For all those solo, high-caliber players out there who won't settle for just any run-of-the-mill puzzles, the inimitable Frank Longo presents a collection of sudoku to challenge the mind and complement any well-tailored suit. The stylish and compact design makes it easy to slip into a dapper briefcase or chic clutch, so puzzle lovers can sate their solving hunger at any moment. It's bound to be the fashion must-have of the season