Dictate the course of history across ten ages, from the first cities to space travel. Accomplish certain objectives and you can move time into a Variant Age - an alternate history with new rules, new technologies, and new units. But beware Crisis Ages; following a path of chaos and disorder may plunge the world into a future filled with war, sickness or ignorance. Then again, a wise ruler can always turn a crisis into an opportunity.... Choose the path with care, as the ages you pass through will have a lasting impact on your people and the world.