A new title in the Fiendish Su Doku series, concentrating entirely on the more difficult Super Fiendish puzzles These previously unpublished quality Su Doku grids from the puzzle providers to the "Times" willhelp extreme puzzles who are looking for a real puzzling challenge. Thetreacherously difficultpuzzles in this collection will stretch even the most advanced Su Doku enthusiast to use all oftheir best solving techniques. These puzzles are of the highest quality and are perfect for the advanced solver in need of a constant supply of ultra-difficult puzzles. They are guaranteed to provide hours of mind-stretching entertainment."