Synth City

The Synth City was a sub world introduced during RB Battles to Sonic Speed Simulator! It is accessed from Green Hill and is mainly associated with Invisible Espio and RB Battles. Its primary purpose was to serve as a large obby for players to complete, earning Badges along the way.
==Events==
This subzone is home to: 
*Synth City Race
==Trivia==
* The obby entrance was moved from the spawn area of Green Hill to where Lost Valley's big world ring was, in the back end of Green Hill besides its enchant station
==Gallery==
File:Synth City(invis espio).png|The location of Invisible Espio
File:Synth City Obby.png|The exterior's entrance
File:Synth City(1).png|The Interior's entrance
File:Synth City(switch).png|A hidden switch
File:Synth City Obby(2).png|Synth City's new entrance