The Guardian Killer Sudoku 1 - A Collection of More Than 200 Challenging Puzzles | The Guardian

210 difficult previously unpublished killer Sudoku puzzles.

The Guardian's killer sudoku puzzles are enjoyed by hundreds of thousands of people every day. While only a minimal level of mathematical knowledge is needed, all of your logical reasoning will be required to solve these brand-new puzzles. The puzzles have been designed to increase in difficulty as the book progresses, meaning this book can be enjoyed by novice and master alike.