Get hooked on this utterly addictive collection of DIFFICULT su doku puzzles for those who like their puzzles with a bit more bite!
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Here are all new Difficult puzzles . . . with teeth! 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!
