Flight2:

Age System: The game features three distinct Ages: Antiquity, Exploration, and Modern. Each Age has unique tech and civic trees. Civilizations are tied to one age, with leaders choosing a new civilization to transform into for the next Age. For example, Augustus leading Rome in the Antiquity Age can transition to the Normans in the Exploration Age and the French Empire in the Modern Age. Specific gameplay elements, like owning 3 Horse Resources, can unlock options like Mongolia in the Exploration Age. A temporary 'Crisis' occurs during each Age shift, requiring players to implement negative policies to balance the game.

Influence Yield: A new yield type, Influence, is introduced for conducting diplomacy with other civilizations.

Rivers: Rivers are now categorized into small rivers (crossable normally) and wide, navigable rivers. Navigable rivers allow Naval Units and embarked Units to travel through them. Both types of rivers now run through tiles instead of along their edges.

Settlements: Cities are now divided into two categories: Cities and Towns, both falling under the broader term 'Settlements'. All Settlements, except the Capital, begin as Towns, which cannot produce anything independently.