Some of the taxa in the game are radially symmetrical animals, whales and more well-known ones, e.g. The two unicellular taxa, prokaryotes and eukaryotes (or bacteria and amoeba) are treated separately.

One characteristic of the game is that all taxa of multicellular animals have the same requirements, which is why it is possible, for example, for intelligent molluscs to develop. The energy budget depends on the level of development of the planet and the chosen level of difficulty in the simplest mode it is unlimited.

For example, 50 units are required to process a single terrain field it takes 500 units to build a terraforming tool. Īll actions carried out by the player have a certain price, which is given in 'energy units' or 'Ω units'. Volcanic eruptions increase the proportion of dust particles in the atmosphere and lower the global temperature Earthquakes under water can cause tsunamis nuclear fuel shortages can lead to nuclear war among civilizations dependent on nuclear energy. The impact on the planet can be very minor or very far-reaching, depending on the circumstances. The list of disasters ranges from natural occurrences such as hurricanes and fires to population-dependent events such as epidemics and pollution. Oxygen generators, which enrich the atmosphere with oxygen, or the monolith, a reference to the one in 2001: A Space Odyssey, which promotes the development of intelligence. In addition, the player receives various tools that intervene in the development of the planet, such as. The control over the simulated planet is very extensive Control windows allow the player to regulate everything from atmospheric gases to the speed of continental drift to the reproduction and mutation rate of life forms. SimEarth simulates the Gaia model after Lynn Margulis and James Lovelock (who helped develop the game as a guide and wrote an introduction), and one game scenario is the simplified ' Daisyworld ' model. After this time at the latest, it is assumed that the sun will turn into a red giant and all life on the planet will die off. The stages of development of the planet can be reversed and repeated until the planet 'dies' 10 billion years after its creation. The demanding challenge is to develop intelligent life and an advanced civilization. The game does not specify any specific mission objectives. In SimEarth, among other things, the player can set the properties of the atmosphere, temperature and land masses of a planet and then settle different forms of life and observe them as they develop further.

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