Confident solvers who think theyve got Sudoku down cold will have to think again, because these are absolutely the most fiendishly difficult, devilishly baffling Sudokus ever devised
and the biggest, too. Created by hand in Japanfrom Nikoli, the company responsible for the puzzles popularity in that countrythe collection includes megasudokus on a 25 x 25 grid, designed to give even the sharpest minds a workout. True to its title, its the ultimate challenge, and one that millions of Sudoku-obsessed fans will find irresistible. And for total newcomers brave enough to high-dive in at the deep end, theres a quick tutorial to get them started.
