In Sonic Mania, Sonic, Tails and Knuckles got transported to West Side Island's Chemical Plant Zone by Dr. Eggman with the Phantom Ruby. Making it to the end of that Zone after overcoming the Amoeba Droid and Eggman's deadly puzzle game, the trio used a tube that led them to Studiopolis Zone. There, after defeating the Heavy Gunner, they boarded the Flying Battery just after defeating Dr. Eggman's Weather Globe.
Continuing their hunt for Eggman, Sonic and his crew eventually arrived in West Side Island's Mirage Saloon Zone. After overcoming the Heavy Magician's tricks in the Zone, Sonic, Tails and Knuckles used a gun-like launcher that launched them towards Oil Ocean Zone. There, they managed to locate Eggman after defeating the Meter Droid, only for the doctor to elude capture once more. Using a flying submarine however, the trio continued their pursuit.
Sonic Mania Plus
In Sonic Mania Plus, Dr. Eggman used the Phantom Ruby to warp Sonic, Tails, Knuckles, Mighty and Ray to West Side Island's Chemical Plant Zone. After defeating the Amoeba Droid and Eggman's deadly puzzle game, the group found a pipe that led them to Studiopolis Zone. Soon after their arrival, they defeated the Heavy Gunner when he attacked them. Afterward, they overcame Eggman's Weather Globe before hitching a ride on the Flying Battery.
While continuing their hunt for Eggman, Sonic and co. arrived in Mirage Saloon Zone. At the end of that Zone, they overcame the Heavy Magician. The group then traveled to Oil Ocean Zone using a gun-like launcher. There, after defeating the Meter Droid, Sonic and co. defeated Eggman's Mega Octus. When Eggman eluded capture however, the heroes used a flying submarine to reach Angel Island.
After defeating Eggman for good, Sonic and co. went to an ice cream parlor in Mirage Saloon Zone. There, they got a surprise visit from the Heavy King.
- Chemical Plant Zone - A factory built to manufacture industrial chemicals.
- Mirage Saloon Zone - A desert region that is filled with ice-cream serving saloons.
- Oil Ocean Zone - A massive valley flooded by the spillage from various oil rigs.
- Studiopolis Zone - A glowing city used as Dr. Eggman's personal Television Station.