SimEarth (PC)
CheatingDome.com
Joke Gaia
For a joke Gaia screen in which the planet is in a breakfast scene enter "joke" anytime while playing.
Smoother Planet
To make your planet have a smooth surface enter "smooth" any time while playing.
Various Codes
Enter one of the following case-sensitive codes during game play:
Code
Effect
erad
Plants and animals are extinct
fund
More money
rand
Random altitudes