ELI5: Explain Like I'm 5

SimEarth

SimEarth is a computer game that simulates the development of a planet. The game is designed to model the four major systems (atmosphere, lithosphere, biosphere, and hydrosphere) that interact to support life on Earth. You are in charge of growing and managing a planet, creating different ecosystems and building healthy environments for creatures to live in. You must keep these systems in balance to make sure your planet thrives. In the game, you’ll be able to adjust air composition and temperature, manage volcanoes and earthquakes, and create species and watch how they evolve over time. You can also play different scenarios to explore alternative ways of developing a planet, learning about the fascinating complexity of Earth-like worlds.