However, you will spend most of your time at Station Square and Mystic Ruins. There are 3 main hub worlds in this game, they are: Eggman, a stone appears in front of Tail's workshop, which is the key to unlock the level Windy Valley. Eggman and fights his machine: The EGG HORNET. He then invites Sonic over to his workshop where he is approached by Dr. Tails laughs it off, saying he was trying out a new fuel source: the chaos emerald.
Sonic finds him, and the duo head back to the pool area. He notices Tails flying above, however, his plane begins to sputter and ultimately crashes somewhere along the coast. After beating it, a cutscene plays, which shows Sonic enjoying the beach, relaxing on a sunbathing chair. Sonic's story starts off with him in a blocked off portion of the city, fighting a creature known as 'Chaos'. Each character has their own story, however, they collide at numerous points.