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—each puzzle is handcrafted, not churned out by a computer program, which makes it uniquely elegant and interactive. The authors are with their solver every step of the way, anticipating the next move and putting up roadblocks. This next level—genius level—is for every puzzler who craves extreme challenge and actually enjoys having their neurons tied in knots—as, number by number, the solution falls into place and they can celebrate victory.