Do you like a good challenge? Are you the type of person who solves puzzles in pen? Is your motto, “No pain, no gain”? If so, you are holding the perfect sudoku book in your hands. Whether you are a sudoku samurai or a newbie, these more than 140 we-dare-you-to-try-them challenging puzzles will give your brain a workout! You’d best put your pen away and sharpen a pencil or two!
BONUS: Portable, Concealed, Spiral Format