Penguin Sudoku : A Year's Supply of Sudoku and Some Fiendish New Japanese Puzzles -- Paperback

Contains 365 fiendish brainteasers, ranging from easy to mind-bogglingly difficult. This book provides a daily fix for the hardened Sudoku fan and sets an addictive challenge for novices. It's more than a game. It also features two brainteasers from Japan to further push your puzzling abilities.