Prickly Sudoku: 200 Medium, Break-a-Sweat, Moderately Difficult, Intermediate Puzzles (Paperback) (ISBN-13: 9781500554873)

Kiyo Tanaka has been fascinated with the manipulation of numbers since her father introduced her to Sudoku puzzles at the age seven. Many years later, after pursuing a degree in mathematics and moving to the United States, Kiyo now spends her days working as an economic analyst and her nights pursuing her childhood puzzle passion. She gets a secret pleasure out of being able to now call herself a published "puzzle creator" and wants to make Sudoku puzzles accessible to all, including budding child logicians, like she once was herself. Kiyo hopes her Sudoku puzzle books bring people a small piece of tranquility in their day and help to improve their memory and logic, because she is a firm believer in the powerful exercise Sudoku puzzles can provide for the brain.