"A knotty puzzle may hold up a scientist for a century," wrote Isaac Asimov in The Robots of Dawn, and here puzzle and games creator Tim Dedopulos gives us a hundred knotty puzzles inspired by the works of Asimov and other masters of science fiction. These brain-busting illustrated riddles, enigmas, and conundrums take you to worlds like Trantor in the Galactic Empire, Ray Bradbury's dystopian America in Fahrenheit 451, and Ursula K. Le Guin's Earthsea.