New York Post Electrifying Su Doku: 150 Difficult Puzzles
The official utterly addictive number-placing puzzleElectrify your mind with these all new Difficult puzzles. These entertaining puzzles offer more than just hours of fun—Su Doku engages your brain, improves your concentration, and helps you stay mentally fit. With 150 brand-new puzzles to complete, you'll become a Su Doku master in no time!