X-Factor SuDoku

Catch the latest wave in Sudoku-mania! These 275 X-Factor SuDoku puzzles are for the diagonally challenged in 6 difficulty levels from Simple to Fiendish.<p>X-Factor puzzles follow the same rules as for regular SuDoku puzzles PLUS the two shaded diagonal regions also contain the numbers 1 to 9 once only.<p>Each X-Factor puzzle is joined to a previous and following puzzle through common puzzle solution numbers. As well this book is an extension of The World's Longest SuDoku Puzzle now at 1271 puzzles in length.<p>Includes strategy guide for solving SuDoku puzzles and tips on how to find X-Factor numbers. And for those who still can't get enough try solving 275 riddles!<p>Joe Defries is a current 2-time Guinness World Record holder and is the joe in suJoku.com & joe-ks.com (the Largest Source of Internet Humour).Betcha Can't Beat That!*<p>* re Joe's 'super-human puzzling feat' - the World's Longest SuDoku Marathon - as published in The Addict's Guide to Everything Sudoku by Fiorella Grossi Fair Winds Press 2007