New York Post Mind-blowing Su Doku: 150 Fiendish Puzzles
The official utterly addictive number-placing puzzle
Warning: without proper precautions, these all new Fiendish puzzles may just blow your mind. 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!