Sudoku addicts—this is your utopia for puzzle perfection! With 336 fabulous Sudoku, divided into medium, hard, and very hard, this oversized, fun-filled collection gives solvers hours of entertainment and a chance to build their skills. Give yourself a real mental workout. Start with the solutions for four different solving strategies. Learn how to exclude options by finding a box where only one number is possible; situate the right number; recognize patterns; and do &quot;framesecuring&quot;—a technique that’s helpful when completing the most difficult Sudoku. <br>Created by two of the world’s best puzzle masters, Sudoku-utopia offers an unforgettably challenging, mind-blowing, brainteasing, logic-building experience!