The 504 Travel Size GOKIGEN Puzzles in this book are all built on a 6x6 square grids. Every cell in the grid must have a diagonal line inserted. The numbers at the corners of some cells indicates the number of diagonals which converge on that point. The diagonal lines must not form a loop of any size. There are 5 books in this series We hope you enjoy the puzzles in our books. We work hard to prevent duplicate...