New York Post Lethal Su Doku 150 Fiendish Puzzles

The Official Utterly Addictive Number-Placing Puzzle This 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!