الوصف
If you or anyone you know - from relatives to friends to the mailman - is on the verge of addiction, frustrated with how much fun Sudoku can be, this book is perfect. It offers over 200+ Frustratingly Difficult puzzles with places to record your time so you can chart your progress. Each puzzle is new, offers only one solution, so you can't cheat by guessing, and the answers are available online. 174 puzzles are of the 9 x 9 variety, with 28 puzzles of the more difficult 16 x 16 variety.