Penguin Sudoku 2013

This is an entire year's worth of 365 sudoku puzzles at five levels from easy to brain-taxingly difficult in one addictive and competitively priced book, "Penguin Sudoku 2013" was created by puzzle expert and TV quiz writer David J Bodycombe. His globally successful "Penguin Sudoku" series has sold over 300,000 copies in the past four years