This futuristiccity appears to be controlled by the monopolistic "HEXAeco" energy company, as a majority of the tall buildings and roadways are powered by them.
After his defeat at Ocean Palace, Dr. Eggman has fled into the city, has taken over the industry and is stealing their energy, so Team Sonic sets out to release it from his control. Team Dark realizes that the city must be crushed and be rid of the Doctor's robot army swarming the city (which would also free it). Team Rose continues to follow Amy on her quest to find Sonic, whom she correctly believes to be in the city. Team Chaotix must destroy all of the robots in the city on the orders of Eggman, meaning that Neo Metal Sonic took over the city instead, showing that it must have been a valuable asset to him.
The following is a list of requirements to attain a rank for each mission with each team.
In Team Chaotix's mission, after Vector says "Boy, it doesn't look good", Espio says "I'll handle it". However, the subtitles read "Leave this to me".
This is the first stage which Team Dark is able to explore the most, since Team Sonic can only traverse the shuttle loop course in Super Hard Mode as a teleport collision object is placed the building's pipe that takes the team to the destination (with 2 vertical platformed blimps on the between them while landing onto a building roof with 3 enemies).
One of the light decorative objects is located outside of the interior building which was not meant to be there. It was discovered with the help of cheats for the jump and speed modifications.
Ahead from the first Goal Ring in the 2-player version of the stage, there are objects that were left unused like the Rings that go to the balloon above the metal grill ceiling and the second Goal Ring that is only reachable with the Light Speed Dash. This was originally the location of the goal, but the game developers decided to re-arrange it so that every team had a chance to finish the Stage.