To access the hidden Professional mode, first, beat the game. Then on the title screen, highlight ''New Game'' and press Down or Select
Below is a list of enemies in the simulation section of the game, and what they do to your town.
Bat - Kidnaps four residents at a time (kill with one hit)
Blue Devil - Destroys one house at a time (kill with three hits)
Red Devil - Destroys a field of crops (kill with four hits)
Skull - Causes earthquakes (kill with eight hits)
Hidden Extra Lives
Here is how to find four hidden extra lives in the game's towns:
Bloodpool - Make it rain over the big lake.
Fillmore - When you get the Compass, use it here.
Kasandora - Cause an earthquake after uncovering the pyramid.
Northwall - Strike the town's shrine with a lightning bolt.
Northwall Monster Lairs:
It may not be immediately clear, but all enemy lairs can be sealed in snowy Northwall. While the snow and ice around a couple of them cannot be removed, you can still order your residents to seal the lairs over the snow and ice. This is the only town in the game where this can be done.
Once the residents of Bloodpool learn how to plant wheat instead of corn, you can gain an infinite amount of wheat product from them as an offering. Use it on corn fields in other towns to teach them how to plant wheat as well. Wheat will allow populations to grow higher and quicker, since it feeds more people, and can't be destroyed by earthquakes. Therefore, after planting wheat somewhere, cause an earthquake to destroy the corn fields. Thereafter, the residents of the town will replant their crops, but this time, they'll plant wheat. Then, all you have to do is watch your population grow!