New York Post Guru Su Doku : Fiendish

The official utterly addictive number-placing puzzle

Give your brain a workout with these all new Fiendishly difficult puzzles. These entertaining puzzles offer more than just hours of fun—Su Doku engages your mind, improves your concentration, and helps you stay mentally fit. If you can complete these 150 brand-new puzzles, you're a true Su Doku guru!