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 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.

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.