However, as opposed to the numerous civilizations that are present in Age of Empires which differ in statistics, tech tree availability and a few unique units and upgrades, Age of Mythology has three factions which differ visually and functionally in their entirety – the Greek, the Egyptians, and the Norse. Age of Mythology is a spin-off title from the Age of Empires series of real-time strategy games, sharing most of its gameplay with prior titles in the series.