You are Zeus, patron storm god of Olympia, which is being attacked by Spartans. You must defend your city by manipulating the weather: wind, torrential downpours, lightning, even tornadoes, and hurling these at the unsuspecting enemy. The potency of these abilities depends on the difference in faith stats between your people and theirs--the more you attack them, the more they believe in you, ramping up the difficulty.
The sequel to this game: in defeating the Spartans you have absorbed their symbol and source of power, the almighty lambda. Now use it to create Scheme programs to control your storms AND your armies in a valiant sortie to turn back the tide of the endless Persian hordes.