This Book contains 200 Killer Sudoku (a.k.a. Sums Sudoku, Sums Number Place, Samunamupure, Kikagaku Nampure) puzzles of varying difficulty with solutions for each at the back of the book. There are also instructions and an example to get you started. A perfect diversion for travelling or when on holiday sitting on the beach or by the pool or just to stretch your mind during a break at work. Maybe even sat at home on a dreary day with nothing to do. A bit of brain training to keep you alert and relieve the boredom. For adults and teens and seniors if you fancy trying something different or a gift for an ardent puzzler you may know.