New Civilization 2 (Leader 2)

Age System: The game is divided into Antiquity, Exploration, and Modern Ages, each with unique tech and civic trees. Civilizations are tied to an Age, and leaders can choose to transform into a new civilization for the next Age, influenced by gameplay elements (e.g., owning 3 Horse Resources allows transformation into Mongolia in the Exploration Age).

Age Transitions & Crises: Players face a temporary 'Crisis' during each Age shift, requiring the addition of negative policies to balance the game and prevent snowballing.

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

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

Settlements: Settlements are divided into Cities and Towns. All settlements, except the Capital, start as Towns, which accrue yields and allow building purchases but cannot produce anything directly (Production is converted to Gold). Towns can be upgraded into Cities.

Settlement Naming & Limits: City names are displayed in their native languages. Settlement limits are now Age-dependent.

Settler Units: Settlers are divided into two units: the Founder (a Civilian Unit that produces the Capital) and the Settler unit itself.