Crazy about Su Doku
Murderous Maths: Su Doku has slightly fewer puzzles, but many more helpful hints, advice on strategies, stories, cartoons and puns. It also contains the 22-digit expression that represents the number of different possible 9 x 9 puzzles. The craze has a long way to go. Junior Su Doku costs pound;3.99 (Wizard Books) and Murderous Maths: Su Doku costs pound;2.99 (Scholastic).