Metal Sonic in Sonic the Hedgehog 2 is a hack of Sonic the Hedgehog 2 created by Darkon360/GothicReaper/LoneDevil. It stars Metal Sonic as the playable character instead of Sonic the Hedgehog. The hack comes with 3 different playstyles for Metal Sonic.

Metal Sonic Rebooted is a complete heavy modification of Sonic the Hedgehog 2 by Lone Devil for the Sega Genesis. it features an extensive amount of new art, layouts, mechanics, music, and features that in total creates a different experience.StoryDr'Robotnik has built an advanced army of badniks to search for the Chaos Emeralds, and it's up to Metal Sonic to find the emeralds before them by destroying everything in his way to show Robotnik he shouldn't be replaced.CreditsKCEXE - Music and SFX ports from various Genesis/Megadrive gamesEduardo Knuckles - Music for Magma FactoryClownacy - Sonic 2 Clone Driver v2Dark Sonic - Hardware Testing for v1.1

Motobug the Badnik in Sonic the Hedgehog (aka Motobug in Sonic 1) is a hack of Sonic the Hedgehog for the Sega Mega Drive, by Polygon Jim. As its title suggests, in this hack the main character Sonic the Hedgehog is replaced by Motobug, one of Dr. Robotnik's badniks.So far, some of Sonic's main sprites and animations have been replaced by those of Motobug, Motobug's speed has been decreased (except when powered-up by aSpeed Shoes monitor, which are more numerous), and the sprites of Roller badniks in Spring Yard Zone have been replaced by those of Sonic (referencing a common interpretation by fans that Roller is a robotic impersonation of Sonic, something that officially appeared in later games in the form of Metal Sonic and various others).Of the first release, Polygon Jim stated that he had only tested and confirmed Green Hill Zone (Acts 1-3) for completability. However, upon testing, Katelynn andRGamer2009 reported that other Acts are completable, including:Marble Zone Act 1Spring Yard Zone Acts 1 and 2Labyrinth Zone Acts 1 and 2Star Light Zone Acts 2 and 3Final Zone

Not-so-Super Sonic 2 is a hack of Sonic the Hedgehog 2 by MainMemory. It was first posted in the Random Hack/Mini Project thread, where nobody paid any attention to it. MainMemory said himself that updates would be unlikely, but has changed his mind.

Pepsi in Sonic 1 is a ROM hack of Sonic the Hedgehog by Unlimited Trees (a.k.a HorriblePerson on Sonic Retro). It is a parody hack of a lot of ROM hacks out there, which is why there are things such as horrible level "designs", generic palettes, and the usual character switch. This ROM hack features 6 full length zones (plus bonus stages), 3 (+1) playable characters, and many art edits and secrets!

A hack based on Sonic the hedgehog 2 made by snkenjoi Aperture Science's Portal Gun finds its way into Sonic 2.The portals in the game actually affect objects other than sonic - to the extent that you can kill an enemy with its own projectile if you fling it back at it.Credits:E-122-Psi - sonic's spritesheetflamewing - help with collision detectioniojnekns - portal spritesFraGag - testing

Red Hot Sonic 2 is a hack of Sonic the Hedgehog 2 (16-bit) by redhotsonic. It was his first hack.Started in early 2004, this hack featured two fan characters: Red Hot Sonic and Jet Pack Tails. Several versions were released (0.50, 0.60, 0.70, 0.80, and then finally 0.90). The hack started off bad (especially the palettes) but became more developed over time.

Sally Acorn in Sonic the Hedgehog (aka Sally in Sonic 1) is a fan-made ROM of the game Sonic the Hedgehog for the Sega Mega Drive/Genesis, with Princess Sally Acorn as a playable character in place of Sonic the Hedgehog.The game was modified by Sonic Retro member E-122-Psi, with additional programming and coding by other members including Snkenjoi,MarkeyJester, Aquaslash,Selbi and Hayate.