Ever since sudoku burst onto the scene, solvers found it irresistible. They grabbed any variant they could find and hungrily tested their skills. Well, now we’re upping the ante with 240 new, fabulous and sometimes wildly innovative sudoku, and fans beware: once you start solving, you won’t be able to stop! Give your brain a good workout, but not so impossible that you’ll get frustrated. They come in a variety of levels, so even if you’re a relative beginner, you can work your way up to the hardest “Big Mind Challenge” selection. To help you, there’s an excellent introductory section with tips and techniques.