Terrestrial Planets

The Terrestrial Planet Pack includes the first four planets of our solar system, plus the Moon. This is the first planet pack players are encouraged to begin with and all worlds within are available for free.
Mars, the Moon, and Mercury are available from the start -- Venus is unlocked after beating Mars, and the Earth is unlocked after beating Venus. All five worlds are free to play, but players who wish to unlock Venus and the Earth sooner may elect to do so for a fee.
If played in the intended order, the worlds would be settled as follows:
Mars
The Moon
Mercury
Venus
Earth
There is no unique storyline associated with the Terrestrial Planets -- players are free to explore the emergent culture and history that unfolds over time.