Mass Prod:

Ages System: Civilization VII features three distinct Ages: Antiquity, Exploration, and Modern. Each Age has unique tech and civic trees. Your civilization is bound to one Age, and player choices determine transformations into new civilizations for subsequent Ages. For example, Augustus leading Rome in the Antiquity Age might transform into the Normans in the Exploration Age and the French Empire in the Modern Age. Civilization choices are influenced by the leader, previous civilization, and specific gameplay elements (e.g., owning 3 Horse Resources grants access to Mongolia in the Exploration Age). A temporary 'Crisis' occurs during each Age shift, forcing players to implement negative policies to balance the game and prevent snowballing.

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

River Mechanics: 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 rather than along their edges.

Settlement Types: Cities from previous games are now divided into 'Cities' and 'Towns', both categorized as 'Settlements'. All Settlements, except your Capital, begin as Towns, which are incapable of independent production.