New York Post Lethal Su Doku: 150 Fiendish Puzzles
The OfficialUtterly AddictiveNumber-Placing PuzzleThis Fiendishly tough collection might just be a lethal dose of puzzles. More than just hours of entertainment, 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 master in no time!