Twinkle City

Twinkle City is a former hometown of Sparky and his friends. The other information is known or ever given about this city, it has ever been referred to in video game appearances or any other media, but it appears to be based on the early comic about the lives of the Firefly Fighters. This town was accessible through a portal on Mobius once every three years, during a full moon, which much similar to Mobodoon from Sonic Underground. The phenomenon is considered a uptown-tale by most Mobians.

Description
The town is currently run by Mayor Rosalyn and it is also the birth place of Sparky. The city was based on the design of the beautiful sparks, though the whole town is decorated with colorful crystals (of point-cut). Its existence is maintained by the Power Stone, and allows the town to visit Mobius once every Third year; without the Power Stone, it will quickly fade away and disappear forever. Despite its rich exterior the town does not run on money or any form of currency, just simply share and give what they have to offer. Since Sparky has missed this town after being abandoned, he will can come back at anytime when he visit his former hometown.

Aftermath
The city was taken over, under control by Eggman Nega. However, Nega has plot the revenge on Team Sonic after being defeat. He becomes the new mayor of Twinkle City and has enslave half of the innocent people. He also has stolen the Moon Emeralds' energy to make himself powerful and has brings destruction on Twinkle City. Sparky and friends are induced to leave the city and moved to Station Square for their lives and Twinkle City has disappeared after Nega has destroyed everything which was presious to them.

Gaming Series
On Sonic Ultra Rush, the Twinkle City was once mentioned by Firefly Fighters. They told Sonic and the gang they've already missed it after it disappeared. Sonic tells them they can visit there when reappear, but the gang prefers to stay on Sonic's hometown which it felt more peaceful than thier hometown, which makes Sonic accept their approval.