The Ultimate Book of Su Doku 2

401 NEW PUZZLES BY THE BESTSELLING SU DOKU AUTHOR! There are two types of people in the world today: those hooked on Su Doku, and those about to be. Su Doku is the mind-bending and addictive number placement game that exercises your brain and helps you escape from the stresses of everyday life. Here is the ultimate Su Doku book, with 401 new puzzles divided into four different levels of skill: - Painless - Tricky - Nasty - Migraine