A fundamental introduction to the secrets of Killer Sudoku, along with insider tips for solving even the most difficult puzzles, plus 500 handpicked puzzles across eleven difficulty levels: from baby-easy to ultra-hardcore. With this book, you will acquire the most comprehensive work on Killer Sudoku to date - written and compiled by the currently most sought-after Sudoku and Killer Sudoku expert, Stefan Heine, team captain of the two-time Sudoku world champion Germany. The solutions can be found, as in almost all volumes of this series, conveniently on the page after next - eliminating unnecessary flipping and searching.