LakeFeperd, Sonic Retro

Sonic Before the Sequel (abbreviated Sonic BTS) is a fan game created by LakeFeperd that is meant to explain the events that may have taken place between Sonic the Hedgehog 1 and Sonic the Hedgehog 2. In it, the player plays as Sonic and Tails, alternating between the duo through numerous zones as Sonic goes to stop Dr. Eggman from launching the Death Egg, with Tails trying to keep up and eventually meet and team up with Sonic. An update was released during SAGE 2012, adding improved graphics, an original soundtrack made by Falk, KgZ, Andy Tunstall & Funk Fiction, and a bonus boss if you reach the good ending. A sequel, Sonic After the Sequel, and an interequel, Sonic Before the Sequel Aftermath (which has now formed into another fangame by LakeFeperd called Sonic Chrono Adventure), were released as well.

Overbound Game Studios

Sonic Time Twisted is an open-source Classic Sonic style fan-made game, headed by Overbound. The game tries to improve upon the best features from Sonic the Hedgehog CD and the other Genesis/Mega Drive games. These features including time travel, elemental shields, and 3D special stages. The player controls Sonic and co. and they play like they do in the Genesis titles. Like in Sonic the Hedgehog CD, the player must use time poles (now adjusted to be instant) to travel through two different time zones, Past and Future. In the Past, Sonic must find the Special Stages and collect the Time Stones, while in the Future, Sonic must also find the Special Stages, however, these have the Chaos Emeralds. Beat all 14 Special Stages in each time zone (7 each) and the player will achieve the True Ending. Besides that, the player must traverse through 8 zones, most with 2 acts each, reach the Goal Post at the end, as well as encounter a boss at the end of the stage be it Metal Sonic or one of many loyal Super Badniks.

DNXDelta, Thorn

Sonic 2 Retro Remix is a large-scale ROM hack of Sonic the Hedgehog 2 for the Sega Mega Drive, created by Thorn and DNXDelta. The goal of the project is to create a 2D Sonic the Hedgehog game that requires exploration to progress, as well as the requisite platforming and sheer speed. A mission system akin to those of the 3D Super Mario games is implemented as the means of progressing from one level to the next. Missions involve earning Chaos Emeralds in scavenger hunts, boss battles, speed runs and score attacks; most require learning each level's ins and outs, instead of just finding the easiest way to the goal.

VinnyVideo

Daniel V Fangames (Daniel Villena)

Sparks, MCKaosu, Gamenerd Advance, LarkSS

Headcannon

Mickey Grant

Yoritoshi

~Sonic for me and you~

DimensionWarped

Comet Games

BlueSky Games

Join Buddy on his adventure to take down BluCo Science and save his town from the robot attack. Project Float is a puzzle based platformer with several RPG elements. You play as the child hero who stumbles upon an abandoned sphere who encourages him to help him defeat the robot overlord secretly in charge of this island. On your adventure you find several other robotic spheres who each give you, the player, a unique ability that will help you pass through obstacles.

ZykovEddy

A fan‑made 2D Sonic the Hedgehog game created in GameMaker: Studio using GameMaker Language (GML). Released in 2015 by independent developer ZykovEddy, it recreates the look and feel of the classic Mega Drive/Genesis Sonic titles while introducing original level layouts, custom sprites, and unique gimmicks. Distributed freely online for Windows PC, it is not affiliated with or endorsed by SEGA.

No More Blue

TheBlox

Developed by TheInvisibleSun, this is a specialized ROM hack of Sonic the Hedgehog that focuses exclusively on the "Labyrinth Zone." It introduces a custom hub world, quality-of-life fixes for water physics, and several unique "styles" of water gameplay to make the notoriously difficult level more enjoyable.