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Soleanna New City is a modern city area, with taller buildings, a warehouse district, a train station, and for certain side missions it is shown to have a Highway section (that does not appear in the actual field itself). It also has a cave at one point that leads to a secret room with an unknown purpose (the same room that Shadow and Rouge enter after completing their version of Kingdom Valley). Silver reaches it after his version of White Acropolis and Sonic reaches it once he is told that Knuckles wants to meet him at the Warehouse area. It is also where, after Silver completes his version of White Acropolis and his fight with the Genesis, one can speak with Hatsun the Pigeon. It is implied that this area is, or is part of, the stage of Crisis City. Other times this part of the town of Soleanna was shown was when Silver questioned whether it was right to kill one person to save the world. This scene then leads to their second (and last) talk with the true villain. It also was used in the scene where Sonic, Tails, and Knuckles returned from Flame Core to notice that Shadow and Rouge were not with them, and when Rouge returned from the same area to see that Shadow had not come back with her. It is also the area where Amy takes Elise to after rescuing her from the Egg Carrier and where they have their conversation about love (during which they both fail to know they are actually talking about the same person).
Silver Medal locations
The first medal is floating above the water near the sailboats.
There are actually no roofs on the tall buildings of the area. This can be seen if one hacks the game or performs glitches that can get the player up to the tops of the buildings. If your character falls or jumps into the area where the roof would be, he will fall into a bottomless pit.
This is the field where one can perform the Steel-Box glitch with Sonic. Simply go on a Steel crate (near the area where the shop is) and use Sonic's Slide Kick to make the crate fly up into the air with Sonic on it. It is possible to go past the boundaries using this glitch.