Sim Earth

Sim Earth cheat codes: 
Modify ocean level
Hold [Option] in the Edit window.
Then select "Raise/Lower" land tool. Additional options
should appear allowing you to change the sea level.

More money
Type "fund" while the mouse pointer is in the toolbox.

Plants and animals are extinct
Type "erad" while the mouse pointer is in the toolbox.

Random altitudes
Type "rand" at the map window.

Robots
Place an atomic bomb in a city of the Nanotech Age.
The robots will escape and live as separate life forms.

Smooth terrain
Type "SMOOTH" in uppercase during the game.

Create All Hidden Items
Pause the game and type "motherearth".