Japans's best kept puzzle secret comes to America! Kakuro puzzles, also known as cross sums, are logic puzzles that use a grid and number system much like in sudoku. The Everything Easy Kakuro Book and The Everything Kakuro Challenge Book each present over 200 puzzles of varying degrees of difficulty. Perfect for the number puzzle guru, kakuro uses solving strategies and techniques similar to those used for sudoku. The idea is to fill in blank spaces in the grid with the numbers one through nine, so that they add up to the given clues. Each book includes an explanation of the rules, along with tips and tricks for simpler solving.