We must click on a pile of dirt in the garden. We will then be presented a question with two options for the answer on which is greener, in which means to use less energy and conserve Mother Nature. Correct answers reveal an example (usually a screenshot from any episode) and let us choose a seed to plant in the dirt pile. Clicking on the sprinkler will water the plants and make them grow. When all the dirt piles have fully-grown plants, we may either save your garden or play again. Incorrect answers on the other hand will otherwise have the announcer prove that the opposite is true and explain a reason behind the incorrect answer.
For instance, riding a horse to school (as in the episode "Francine Frensky, Olympic Rider") is greener than driving a car and does not pollute the air with carbon footprints.