GreenSpace

Players select pieces of trash for their GreenSpace Corps avatar to clear. Energy is required to clear trash off the planet. Players receive rewards for cleaning in the form of experience points and credits immediately after each piece of trash is cleaned. Credits are used to build structures. Some structures can also produce credits, releasing the credits after an interval ranging from 15 minutes to one hour. Source: Wikipedia, "GreenSpace", available under the CC-BY-SA License.