Challenge yourself with number puzzles. Previously unpublished quality Su Doku grids from The Times, which help develop your skills to take on Extreme Su Doku. The 200 puzzles in this collection of treacherously difficult puzzles will stretch even the most advanced Su Doku enthusiast. You will need to use all of your best solving techniques to get to the end of this testing challenge. The puzzles in the collection are of the highest quality and are perfect for the advanced solver in need of a constant supply of ultra-difficult puzzles. Guaranteed to provide hours of mind-stretching entertainment. * From The Times, the No.1 for Su Doku * The more difficult Su Doku books sell best, as dedicated puzzlers look for a supply of puzzles * The Times, as the premium brand, is the market leader in this area.