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Chemical Plant is reminiscent of the original Zone, but is placed inside a closed industrial centre.
Story
With Operation Big Wave having been foiled by the Phantom Ruby, Knuckles debriefs the Resistance on their situation. While everyone is brought up to speed about the Eggman Empire's Replica army, Rouge reveals that she has discovered that Eggman has his database in Chemical Plant. In an effort to stop the Eggman Empire's greatest weapon, Classic Sonic and Tails head for the Chemical Plant to find Eggman's database and extract information about Phantom Ruby that they can use against it.
Infiltrating the Chemical Plant, Classic Sonic starts looking for building that the database is in under the guidance of Tails. During the search though, Tails notices that the surroundings are a little too quiet. True enough, the water levels soon start to rise, prompting Tails to tell Classic Sonic to stay sharp.
Eventually, Classic Sonic and Tails find the database. Getting his hack on, Tails shifts through Eggman's personal data, and eventually finds a file on the Phantom Ruby. From it, Tails learns how the Ruby manipulates virtual reality and how Eggman incorporated a portotype into Infinite, which is the source of the jackal's strange powers. He also finds a piece of information that shows that the Phantom Ruby has a weakness.
Gameplay
Some sections contain high-speed warp tubes that can transport the player through walls. Usually, the player will need to destroy the lid seal on them first though.