This is the eighth book in the World Of Sudoku series of handcrafted Sudoku books. This book focuses on advanced Sudoku variants. These variants are very popular with Sudoku experts and regularly feature in various Sudoku contests and championships. The sudoku variants covered in the book are: CAPSULE SUDOKU - POINTING EVENS SUDOKU - SEARCH 9 SUDOKU - GERMAN WHISPERS SUDOKU - X SUMS SUDOKU - CONSECUTIVE CLONE SUDOKU - REGION SUM LINES SUDOKU - DIAGONAL OUTSIDE SUDOKU - RENBAN SUDOKU - SKYSCRAPERS SUDOKU The Sudokus in the book are test solved by Édouard Lebeau - one of the top French solvers and setters, and his timings for each sudoku are also mentioned. The sudokus are arranged in order of their difficulties as per the test solver's timings. Each puzzle has an online solving link for people who like to solve online. The Sudokus in the book are fun to solve, having logical solve path and varying levels of difficulty ranging from generally approachable to very difficult.