Board Thread:Questions and Answers/@comment-26075943-20161019235909/@comment-679780-20161020022907

Y'know, would make more sense if they were around 14-16th century, given that was the Aztecs time. At least judging by how Mystic Ruins looked back then to be Aztec.

Though could mean the Echidnas of the games Sonic's world were far more advance than humans at the time and originally founded Aztec culture.