Coral reefs are some of the most diverse and vital ecosystems on Earth. The colorful underwater colonies of coral polyps, held together by calcium carbonate, provide homes for many marine plants and animals and help keep the ocean's nitrogen levels balanced. But while scientists are aware of where the world’s reef systems are located, there is no complete record of all the different types of coral that live there. Now, NASA researchers are hoping to entice nature lovers, both experts and amateurs, to help them create a comprehensive database of these all-important ecosystems by playing a fun, interactive video game!