Level 1-6 is the sixth level in Ground Hog Day and Bad Piggies.
Simply create a vehicle on the rightmost section of the build grid. It should roll fairly well, and cannot be too light, or it will take the bump in the hill too seriously, and land in the pit. A fan is not required. To get three stars, let the vehicle roll. If it was built correctly, it will coast down the hill, barely collect the star box, and reach the finish.