The Green Book of Sudoku 2
A puzzle can only be solved once, making puzzle books perhaps the most disposable of all books. That’s why the Puzzle Society created The Green Book of Sudoku 2.
With its aqueous (water-based) coating and biodegradable soy inks printed on recycled paper, this eco-friendly book wraps challenging and enjoyable puzzles in a disposable package that minimizes its effect on our environment.
Featuring 200 all-new Sudoku puzzles, The Green Book of Sudoku 2 will keep your brain sharp while you help keep the environment healthy.
About the Author
This website contains affiliate links. If you buy something through one of those links, you don’t pay a penny more, but we receive a small commission.