Sonic Chaos Quest v2.0 is a modification of Sonic the Hedgehog. Story:Exploring Mobius seas Eggman found the Chaos Island. It has giant lake, on bottom of which the sunken ruins of Chaos Shrine which contain the inexhaustible power of Chaos are lying. In order to increase the power of his mechanisms Eggman built the Hydrostation on this lake and plans to conquer the world with the power which he got. Residents of the island asked Sonic for help, so he teamed up with Mighty, Tikal and Metal Sonic to start their Chaos Quest to stop Eggman's evil plans once again!Credits:Programming: Narcologer, Vladikcomper, TheBladNew level art: Narcologer, ShooterNew chunks and layouts: NarcologerSprites: Narcologer, The Spriters Resource, SCAA, Lone DevilMusic: Ivan YO, EgorTC, Nineko, TheBlad

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.

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.

Sonic 2 Long Version (which is released alongside Sonic 2 & Knuckles Long Version) is a more complete version of Sonic 2, which makes it somewhat similar to Sonic 2 Delta. This hack features four levels originally scrapped during Sonic 2's development. No levels have been changed, only added. This hack was written in hex, without the aid of any special hacking programs, because the creator uses a Mac, and no hacking tools had been released on that platform at the time of development.

Sonic the Hedgehog 3 (Nov-3-1993 prototype)...You can get more information's about this prototype in the hidden palace website, here is the link:https://hiddenpalace.org/Main_Page

Sonic the Hedgehog Revelation (or Sonic Revelation) is a hack of Sonic 1 by Animemaster. This hack has many features and will continue to increase them, while the product is under way. It also plans a new zone, made of instruments known as music land. Although the creator hasn't decided on whether the art would be good enough yet. The hack contains the three hedgehogs Sonic, Shadow, Silver as they join to face Eggman once again.