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Sonic 2 Dimps Edition is a hack of Sonic the Hedgehog 2 by Spanner. This hack attempts to mimic what Sonic 2 may have been like if it were created by Dimps. This means incorporating many features found in Dimps games such as random speed boosters. This does not include features common in most modern Sonic titles with the exception of a homing attack. The hack was discontinued due to various reasons and there was currently no intention to return to it, except that somebody else now has the source code and is intending to finish off the job. Version 1.5 was uploaded to fix some reported bugs.

Sonic 2 EX (often abbreviated as S.EX) is a hack of Sonic the Hedgehog 2 for the Sega Mega Drive/Genesis by Mr. EX. Its highlights include spring-based layouts like those of Project Shadow 2, new art and layouts, and original music.

A Hack based on Sonic the Hedgehog 2 made by silent.creature.

Sonic 2 Megamix is the first installment in the Megamix series of hacks by Team Megamix, followed by Sonic Megamix. It was created by Tweaker for submission in the 4th Hacking Contest. It features edited palettes and music.

Future plans were to revamp the hack, including moving it to a split disassembly and revamping the level layouts; the former of which has already been completed. It was also to contain various pieces of original music, as well as imports from other games, such as Sonic Advance 2, or Sonic Jam.

Sonic 2 Millennium Edition is a palette and layout hack of Sonic the Hedgehog 2 for the Sega Mega Drive/Genesis by Striker.

Sonic 2 Recreation is a hack of Sonic the Hedgehog 2 (16-bit) by redhotsonic. It sports an ASM overhaul, multiple characters, new zones, a new boss, a new DAC driver that supports many different sound features, new zone art.

Sonic 2 Retro Remix is a large-scale ROM hack of Sonic the Hedgehog 2 for the Sega Genesis / 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.

Sonic 2 Revamped was a heavy modification of Sonic the Hedgehog 2 created by Irixion. This mod first started out as a layout hack, a test of skill, and what Irixion could do. At the time, it didn't have a name, but after seeking for someone who could help, Tweaker suggested the name Sonic 2: Revamped, and it stuck ever since. It eventually grew into a few close friends helping out, and the project grew into realizing Irixion's vision of the perfect game. After major setbacks and a core crippling incident, the hack was ultimately scrapped.

Sonic 2 Secret Rings Control is a hack of Sonic 2 by MainMemory. It changes the controls to a style similar to Sonic and the Secret Rings, where Sonic moves forward automatically.

Sonic 2 Secret Rings Edition is a hack of Sonic 2 by MainMemory. It features no new art or level layouts, and few new features, instead adding replayability to the original game by adding various missions that you can attempt to complete, although there are several levels where completing certain missions is impossible, and some levels where it is impossible to lose.

Sonic 2 SMTP is a hack of Sonic the Hedgehog 2 made by SMTP. The hack is an ASM/Layout hack with a couple of new features.

Sonic hack based on Sonic 2 by SSRG Team

Sonic 2 The Hybridization Project

Sonic 2 Time Attack is a hack of Sonic the Hedgehog 2 (16-bit) by redhotsonic. It goes without saying, but it will be said regardless: This a Time Attack edition of the game, in which the object of the hack is to play through the zones/acts of Sonic 2 as fast as you can and set the best time records possible. Once you've completed an act, the game will record your time, provided you beat your record.

Sonic UMZ is a hack based on Sonic 2 made by Trinitronity

Special Thanks given to:
MainMemory: SonLVL
Ezrael: Bugfix on how to make Sonic retain his rings at a checkpoint only after exiting a special stage.

This is a hack based if the original Sonic 2, that has been in the works for quite some time. It includes 4 characters to choose from all with different moves that fit them. Every level in this demo has had a background change, along with new music in each act. Layout changes (Knuckles has some of his own) and much more...

Story: Shadow is back and teams up with Robotnik...

Credits:

Project Leader: JoenickROS
Layout: NeofusionBox, JoenickROS, Markeyjester, Electroball, Shockwave, Bakayote
Music and Sound: JoenickROS, Bakayote, KCEXE
Sounddriver: Flamewings S3K driver
Art: Blazer, Bakayote, KCEXE, Asuharamoon
Minor Coding: JoenickROS
Major Coding: Shockwave, Varion Icaria, Ralakimus
Beta Testers: Mike B Berry, ThomasSpeedrunner, Bakayote, Shockwave, Varion Icaria, NeofusionBox, King of Hearts
Natsumi: Credits Sequence
Special Thanks: Shockwave, and Varion Icaria, without them, I might have not been able to fix some of the coding bugs.

Sonic 2: Advanced Edit is a Sonic 2 hack created by rika_chou. The latest release features 3 new levels. Other (incomplete) levels can be accessed by using the level select menu. As of release 3, Sonic 2: Advanced Edit has officially been discontinued.

Made by Team AE Sonic 2 Advanced Edit features 7 entirely new zones, each full of unique enemies and with a boss whose gameplay varies depending on which character you play as. Playable characters are Sonic, Tails, Knuckles and Amy. Furthermore as bonus content, the hack features the 5 zones from the 2008 release, brushed up to be fully playable. Upon completing the 7 main zones, you obtain a code to access the level select from which you can play the bonus zones by selecting "South Island 1".

Sonic 2: Aluminium Edition is a hack of Sonic the Hedgehog 2 for the Sega Mega Drive/Genesis by Dr. Eggfan. It doesn't feature any ASM content nor new layouts, it's pretty much Sonic 2 with a few new visuals, and for some reason completely different names for the same zones. There's also a partially restored Hidden Palace Zone in there.

Sonic 2: Battle Race is a hack of Sonic the Hedgehog 2 for the Sega Mega Drive/Genesis by ColinC10 that allows two players to compete with each other on multiple stages. The hack handles this similarily to Micro Machines as the player must reach the edge of the screen first to win a point. Whoever has the most points at the end of the round is declared the winner. A stage select is available without the need for a cheat code. All zones are playable except Sky Chase and Death Egg. Note that this hack is two player only.