West Side Island (Classic Sonic's world)

West Side Island (ウエストサイドアイランド) is a location in the Sonic the Hedgehog series. It is alternate version of West Side Island from an another dimension set in the recent past.

Past
West Side Island's early history was most likely largely the same as its mainstream counterpart's up until at least some time after the West Side Island incident.

Sonic Mania
In Sonic Mania, Sonic, Tails and Knuckles got transported to West Side Island's Chemical Plant Zone by Dr. Eggman with the Phantom Ruby. After making it to the end of that Zone, the trio used a tube that led them to Studiopolis Zone. There, after defeating the Heavy Gunner, they boarded the Flying Battery just after Eggman slipped through their fingers.

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 final trick 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, only for the doctor to elude capture once more, leaving the heroes to continue their pursuit.

Locations

 * Chemical Plant Zone - A factory built to manufacture industrial chemicals.
 * 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.
 * Mirage Saloon Zone - A desert region that is filled with ice-cream serving saloons.