Mobius Evolution is a heavy modification of Sonic the Hedgehog for the Sega Mega Drive created by Abyssal Leopard with the help of fellow members. The aim of this hack was initially to be a simple level layout hack, but it eventually acquired new features, such as innovative gimmicks, boss battles and other things the player might discover in gameplay.

Sonic Next Genesis a hack of Sonic the Hedgehog inspired by a the 2006 game Sonic the Hedgehog but mostly contains custom content.Credits:RedHotSonic - Sonic 3K's Priority Manager in Sonic 2MarkeyJester - 128 Variation of Disassembly, Background Deformation Code, ASM GuideHiveBrain - Sonic 1 DisassemblyMercury - ReadySonicvladikcomper - Background Deformation EngineStealth - SonED2MainMemory - SonLVL and related programsXenowhirl - SonMapED, Sonic 2 Disassemblysnkenjoi - FlexTornado - Water Guide, Sonic 3 Sound Driver in Sonic 1 TutorialDemonFox - Caterkiller Fix for 3K's PriorityMoDule - Sonic 3K's Priority Manager in Sonic 2shobiz - Sonic 3K's Ring Manager in Sonic 2Sonic master and hitaxas - Splash Screen TutorialsKram1024 - Sonic 3K's Sound Driver in Sonic 1ValleyBell - SMPS Researchflamewing - SMPS2ASMDolphman - Genesis-style Sonic Advance badnik artx\\\_justicehunter\\\_x - Silver spritesDamien - Shadow SpritesThe creators of all the Sonic 1 and 2 Sonic Retro SCHG and SSRG tutorialsSSRG and everyone on itPeople who contributed art to The Spriters ResourceMy cat Nicole for sitting with me while I worked on thisAnd many other people I likely forgot to credit

Sonic 1 Pixel Perfect is a ROM hack of Sonic the Hedgehog for the Sega Mega Drive / Genesis by JcFerggy and NovaWizard. The hack features new extended layouts and art, custom loops and tubes, dynamic palettes for the acts, and a complete new Green Hill Zone layout (with edited boss) as of the first beta release.

Sonic the Hedgehog Spinball, or Sonic Spinball (ソニック・スピンボール Sonikku Supinbōru?), is a pinball video game in the Sonic the Hedgehog series. It was originally released for the Sega Mega Drive/Genesis in 1993 and later ported to the Sega Game Gear and Sega Master System in 1995.The term "Spinball" is a portmanteau on pinball and "spin dash", a move Sonic performs. It, along with Dr. Robotnik's Mean Bean Machine were the only two Sonic games released to use characters and elements from the Adventures of Sonic the Hedgehog and Sonic the Hedgehog cartoons.

A Sonic the hedgehog hack made by Scrap SorraStory:The evil Dr. Robotnik has been meddling with time itself! In order to stop him and prevent a bad future for South Island, Sonic must travel through time and stop the Doctor's evil schemes!Featuring 9 acts filled with exploration, platforming, and speed, take control of Sonic to put an end to Dr. Robotnik's plot!Credits:DeltaWooloo - Coding, Music, SFX portingProjectFM - CodingTheInvisibleSun - Coding, MusicDjohe - Help porting Sonic 2's ObjD9MrJoker27 Productions - MusicNaoto - CD extended camera guideKonrad - Mozzietron enemy ported to sonicInferno - Air Roll guideYami - After-image objectvladikcomper - Advanced error handlerFlamewing - Flamewing's DMA transferSonic CD, Knuckles' Chaotix: Various art, Ecco 1/Ecco 2: Text, various art.