The third in a series of games that has gradualy evolved as Civilizations themselves do, Civilization III draws on the history of Civilization I & II to create a new evolution for the franchise. Many minor adjustments and fixes have been made, along with bigger tweaks that hail from Firaxis' Alpha Centauri, such as unique factions. In Civilization one guides a civilization through war and peace over hundreds of years, from its birth to the Modern age. The turn based gameplay is singleplayer only, and is moddable with custom scenarios.