A new method of world domination.
Some users will not care about high scores, but I look at it as a challenge. The game is very challenging towards the end if you play against the maximum number of Civilizations. If you cannot stay in the technological lead, you will find yourself struggling for survival.
As you progress in technology you will be able to unlock the technology of building both in Outer Space and Under the Sea (in addition to building on land).
I've seen the screen shots for the game play for Civilization IV and they seem to have taken this gameplay engine and refined it, it appears that Call to Power was the forerunner of this new gameplay engine. For anyone who likes Civilization, Call to Power is a great game to own for any true fan.