Supreme Commander is focused on using a giant bipedal mech called an Armored Command Unit (or ACU) to build a base, then upgrading units to reach higher technology tiers, and conquering opponents. The player can command one of three factions: the Aeon Illuminate, the Cybran Nation, or the United Earth Federation. Supreme Commander was highly anticipated in pre-release previews, and was well received by critics, with a Metacritic average of 86 out of 100.[3]