WorldCat: When Gargamel chases the Smurfs through a portal to a strange land, they must figure out how to reopen it to return home and avoid being captured by the evil wizard.
Goodreads: It’s the smurfiest night of the year—the Blue Moon Festival—and everyone in Smurf Village is excited! But just as the blue moon begins to rise, the evil wizard Gargamel appears and chases Papa Smurf, Clumsy, Brainy, Gutsy, Grouchy, and Smurfette through a magical portal and into a world they’ve never seen before. Can the Smurfs navigate this strange world and smurf a blue moon to bring them back to their village before Gargamel catches them?