<blockquote> <p> The official utterly addictive number-placing puzzle </p> </blockquote> <p> Give your brain a workout with these all new Difficult-level 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. With 150 brand-new puzzles to complete, you'll become a Su Doku guru in no time! </p>