Book excerpt: More challenging and more addictive than Sudoku, Kakuro is the newest puzzle craze. It outsells Sudoku in Japan where addictive number puzzles first hit. The Original Kakuro Bookis a collection of 100 of these highly addictive puzzles created by the editors at The Puzzle Society. Kakuro is a cross between traditional crosswords and Sudoku. The idea behind Kakuro is very simple. Just like Sudoku, you must fit the numbers 1 to 9 into a grid of squares so that no number is repeated within a defined area. And just like a crossword, there's a grid of filled blocks and clues to solve. Kakuro puzzles are best solved using logic. Some of the same logic can be used as in Sudoku, but you also need a bit of math because with Kakuro there is a second restraint: not only must the numbers not repeat within a clue run, they also must add up to given totals-these totals replace traditional word clues found in a crossword. Complete, easy-to-follow instructions are included as well as handy tips. This book also features tables of number combinations for quick reference. Solutions for all puzzles will be included at the back of the book. Get in front of the latest puzzle phenomenon withThe Original Kakuro Book.