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Anacreon eras represent various stages of development of the game's code. Prior to 2017, Eras were referred to as Alphas and Betas. There were 7 Alpha and 1 Beta eras before the first named era (which was Era 3). As of 2018, all existing Anacreon games had been updated to run Era 3 code, but retained features from previous eras such as legacy structures and map layouts.