Sonic the Hedgehog 2 (World) (Rev A) [Hack by Ultima v0.21] (~Tohaka)

This is a fan-made ROM hack of Sonic the Hedgehog 2 for the SEGA Genesis, specifically version 0.21 created by a modder known as Ultima. Based on the World (Rev A) release of the original game, this hack was built by modifying the existing code to alter gameplay elements, levels, or mechanics. It circulates in the retro gaming community as a work-in-progress build intended to offer a new twist on a classic 16-bit platformer. Release details are sparse, but the hack itself likely emerged in the late 1990s or early 2000s through online ROM hacking forums.

You control Sonic or Tails through side-scrolling levels at high speed, collecting golden rings and defeating enemies by jumping or using the spin attack. The core loop remains identical to the original: you traverse zones, avoid hazards and badniks, and reach the goal post at the end of each act. The hack may include custom level layouts, altered enemy placement, or tweaked physics, but the fundamental objective is the same - run fast, explore, and gather enough rings to survive. If you can reach the end, you face a boss fight before advancing to the next zone.

For fans of Sonic 2 who have played the original dozens of times, this hack injects new challenges and surprises. The v0.21 label suggests it is still incomplete, so you might encounter rough edges or unfinished content. It is worth trying if you enjoy seeing how modders reinterpret classic levels, but do not expect a polished experience. The Genesis library is full of official titles that work without glitches, so this one is best suited for those curious about the inner workings of ROM hacks rather than casual players.