Genius-level Sudoku ― Over 300 Super-difficult Puzzles from the Japanese Masters Who Invented the Game

Our hardest-yet Sudoku collection, handcrafted by the puzzle masters at Nikoli in Japan (whose Workman Sudoku books have 1.3 million copies in print combined).Warning:Not for the Sudoku faint-of-heart! Introducing a book of extra tough, extra thorny―and extra addictive―puzzles specially designed for people with Einstein-level Sudoku IQs. Sharpen your pencil. Warm up your gray matter. And pit your wits against the top Japanese puzzle makers in the world. Genius-Level Sudoku features more than 300 brand-new challenges, all rated Good Luck!The latest collection from Nikoli, the company that invented the game and helped launch Sudoku-mania worldwide more than twenty years ago, joins The Original Sudoku, Expert Sudoku, X-Treme Sudoku, and other books and calendars with over 3 million copies in print. Nikoli is famous not only for being the first to make Sudoku puzzles, but for being the best―