Engaging in side activities is necessary to push the plot forward and open yourself a safe entrance to more and more "advanced" regions of the world.
In return for the elimination of opponents, completing tasks (main and side) or exploring the world, we receive experience points, and after collecting the appropriate number of them - we advance to the next levels. In addition to Attica, the center of which is Athens, and Laconia, where Sparta is located, there are, among others, Macedonia, Delphi (seat of the famous oracle), Olympia inviting to sports competition, and the island of Crete, where the ruins of Knossos are located.