|Gigalopolis did not originate from fanon, and more information can be found on their respective wiki(s). You may read more about it on the following wiki(s):|
Gigalopolis makes an appearance in Sonic Heroes 2. Here, much of the construction work has been abandoned, and it is a rotting wasteground.
Due it also being nocturnal and urban, Gigalopolis has drawn similarities to Star Light Zone.