Download or read book Second-Degree Green Belt Sudoku® written by Frank Longo and published by Sterling Publishing Company, Inc.. This book was released on 2005-11 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: With a separate sudoku book for every level, this work helps puzzle lovers play this popular game. Taking a page from karate - another Japanese art, each title is graded by colour: White Belt for easy, Green Belt for medium level, Brown Belt for hard, and Black Belt for the super-tough solvers. Each book includes 300 puzzles.