New York Post Guru Su Doku: 150 Fiendish Puzzles

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