The new Civilization brings the familiar concept of playing the leader of a nation of your choice and securing your position in the world by peaceful and/or military expansion and technological advancement, covering the usual period from 4000 BC to 2050 AD. This time, the game will introduce some minor changes, which are mostly cosmetic in nature, such as replacing the shields needed for building objects or units by hammers. However, the fourth Civilization game will also bring some important innovations, which will significantly influence the game play and even alter to a degree the basic concept of the game.