HarperCollins Publishers Ltd.: New York Post Snow Storm Su Doku (Difficult)

The Official Utterly Addictive Number-Placing Puzzle

Let it snow, let it snow . . . Su Doku! Enjoy a winter's wonderland of brain-teasing fun with these all new Difficult 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!