"The Best Puzzles Are Made by Happy Employees." So Ad Age describes the credo of Nikoli, the Japanese puzzle company that invented the Sudoku craze and supplies 100% of the puzzles published in Japanese newspapers and magazines. And when they say "made," they mean literally handmade--unlike the computer-generated puzzles found in other American Sudoku products. And that's one of the features that makes THE ORIGINAL SUDOKU BOOK 2-- and THE ORIGINAL...