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 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: SonLVLEzrael: 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: JoenickROSLayout: NeofusionBox, JoenickROS, Markeyjester, Electroball, Shockwave, BakayoteMusic and Sound: JoenickROS, Bakayote, KCEXESounddriver: Flamewings S3K driverArt: Blazer, Bakayote, KCEXE, AsuharamoonMinor Coding: JoenickROSMajor Coding: Shockwave, Varion Icaria, RalakimusBeta Testers: Mike B Berry, ThomasSpeedrunner, Bakayote, Shockwave, Varion Icaria, NeofusionBox, King of HeartsNatsumi: Credits SequenceSpecial 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.