Would you like to learn more about Sudoku?  We can help!  You can request The Mathematics of Games and Puzzles from Cards to Sudoku (a Great Courses DVD) or Taking Sudoku Seriously: The Math Behind the World's Most Popular Pencil Puzzle (a book) to expand your knowledge.  Or, if you're more interested in books containing more Sudoku puzzles, you might enjoy Advanced Sudoku and Other Japanese Mind Puzzles or Master Sudoku.  In the meantime, we hope you enjoy this month's puzzle.