The core loop remains familiar—gathering resources, building bases, and training armies—but AoE III introduced several unique features that distinguish it from the rest of the series:

Players progress through five ages: Discovery, Colonial, Fortress, Industrial, and Imperial.

Official multiplayer services for the original 2007 version ceased on October 30, 2024, due to aging technology.

A persistent RPG-like mechanic where players can send "shipments" of resources, troops, or upgrades from their European capital.