Many older forum threads mention "Empire Earth Portable" for the PlayStation Portable (PSP).
While Age of Empires covered a few distinct ages, Empire Earth spanned . You could start a match in the Prehistoric Age, throwing rocks at enemies, and end the same match in the Nano Age, deploying cyborgs and flying saucers. The sheer scale was breathtaking. It offered a "random map" generator with endless customization, allowing players to lock the game into specific eras (like World War II) or let technology evolve over hours of gameplay. empire earth portable