Here are some cheats and tips for the game SimEarth.
World select:
Enter the main menu from the title screen. Choose the scenario
command without using Start. Hold L + R +
Y and press A to enter the world select screen.
Select any of the eight worlds for game play.
Cheat mode:
Hold L + R and press Start at the title
screen. This will allow access to a sound test, the ending sequence,
and the Gaia list.