Sonic the Hedgehog 2 (16-bit)

The first Mega Drive Sonic sequel, from 1992. Set on West Side Island. "'In the midst of his ever so carefree adventures, Sonic suddenly came across one island." "It was a small island, with pleasant green meadows spread throughout it." "'Alright, I'm gonna take a short break.'"

"Sonic's beloved plane Tornado slipped into the island's silhouette while drawing white arcs with the exhaust smoke--then, as if it were following him, a suspicious shiny figure faded into the opposite side of the island."

"The Legend of the Illusionary West Side Island"

"In the remote past, the people of this island developed civilisations by using the mysterious stones, and had lived highly prosperous lives." "However, that prosperity had been brought to nothing in a single night by people who tried using the stones in unintended ways, and the mysterious stones are said to have ended up being sealed somewhere in the island by the gods.' - — Sonic the Hedgehog 2 (16-bit) Japanese instruction manual, translated by Windii."

Levels

 * Emerald Hill Zone
 * Chemical Plant Zone
 * Aquatic Ruin Zone
 * Casino Night Zone
 * Hill Top Zone
 * Mystic Cave Zone
 * Oil Ocean Zone
 * Metropolis Zone
 * Sky Chase Zone
 * Wing Fortress Zone
 * Death Egg Zone
 * Hidden Palace Zone (2013 re-release and some betas only)