Users accessing the site were able to create their own artificial life forms, building carnivores or herbivores from a select few component parts (heads, bodies, eyes, and wheels). Their "digital DNA" was linked to each component and the completed creature's attributes (speed, visual perception, rate of digestion, etc.) was determined by the combination of each feature's strengths and weaknesses—their "fitness for survival." Once a creature design was finished, users would name their digital creature, tag it with their e-mail address, and enter it into the digital environment.