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!

Ray the Flying Squirrel in Sonic the Hedgehog is a fan-made ROM of the game Sonic the Hedgehog for the Sega Mega Drive/Genesis, featuring the character Ray the Flying Squirrel in place of Sonic the Hedgehog, the game's usual protagonist. The creator of the hack is Fabricechaotix.Ray the Flying Squirrel has a air glide move similar to Knuckles but the air glide does no damage when touching enemies. The air glide also does not stop when touching walls. Unlike many Sonic 1 hacks there is no spin dash move.

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.

Sally Acorn in Sonic the Hedgehog 2 (aka Sally in Sonic 2) is a fan-made ROM of the game Sonic the Hedgehog 2 for the Sega Mega Drive/Genesis, with Princess Sally Acorn as a playable character in place of Sonic the HedgehogThe game was modified by Sonic Retro member E-122-Psi, with additional programming and coding by other members including MainMemory, Qiuu and Snkenjoi.

Socket the Hedgeduck is an in-progress, unofficial port of levels and assets (art, custom objects, and more) from the Sonic clone titled "Socket/Time Dominator" to the Sonic 1 engine. (The title is a portmanteau on "Socket" and "Hedgehog", since the hack contains assets from Socket shoved into the Sonic 1 engine). It contains various standard platforming zones, bonus zones, and acts from the High Speed Zone as special stages, as well as various other advanced engine features and new content (such as an expanded music playlist with custom SMPS tunes, warp doors, a bonus and special stage zone feature, and much more). This is a v0.3 demo created specifically for the SHC'16!CREDITS:Tutorials•MarkeyJester: Old SSRG Logo•Mercury: Zone Agnostic objects•FraGag: Sonic 1 ROM Chunks guide•VladikComper: MegaPCM, PCM2DPCM Converter•Tornado: Sonic 1 Water Guide (for AZ, BZLa)•Other peopleHelp•ProjectFM, Clownacy, Nineko, MainMemory: Help with expanding ROM Chunks to $FF/Basic Q&A•LuigiXHero: Hack help and bugfixes•Firerat: Optimizations on the game's object handler and other bugfixes•Nineko: Rainbow Road song (from his publicly released SoniNeko SMPS pack, for Bonus Zone Fence FG2)•"Jakob": IRL friend bug testing on real hardware•AbysmalLeopard: Enlarged GHZ Ball and Level Select BG artToolsEditors/Misc•Techokami: Socketripper phps script and level rips at spriters-resource (this hack wouldn't exist without it!)•GenesisFan64: Socket disasm (used for directly ripping palettes and analysis)•MainMemory: SonLVL and S2NA supportArt•Clownancy (et. al.): Capt. PlanED•KanedaFR: Gens KMod (for ripping art and palettes)•Selbi: Sonic 1 Text Editor, Selbi's Parallax Editor•ComputerNerd/Sonic16: RetroGraphicsToolkit•Hivebrain: PCXPal v4.0•Xenowhirl: SonMapEDAudio•Puto, Nineko: XM3SMPS and XM4SMPS•ValleyBell: VGM2MID, MID2SMPS, SMPSPlay, PCM2DPCM Converter, GRC2MID•Apollolux: VGM2PRE•Shiru: VGM Music Maker

Sonic - Code Gray is a hack of Sonic the Hedgehog by Jdogg. This hack features new layouts, art, music, and ASM edits. Another feature is "Lights Out Zone", a challenging custom-built level which can be accessed by hitting the "?" monitor. Completion of the zone awards you with an extra life/1200 points and warps you to LZ1.

Sonic - Hyper X is a 2004 hack of Sonic the Hedgehog created by Skaarg. It was one of the first Sonic hacks that had all of its music changed. In addition, it also featured modified palettes and layouts. Skaarg had stated that he was going to continue to expand upon his hack, but it seems highly unlikely at this point.

Sonic - The Lost Land is a hack of Sonic the Hedgehog for the Sega Mega Drive by Shadow Fire. The game is comprised of 7 levels, each filled with traps and badniks intent on bringing down Sonic once and for all. There is also a special realm consisting of 6 Chaos Emeralds. If you have collected at least 50 rings by the time you finish the level, you will see a giant ring. Jump into it to be taken to the secret realm. A dynamic palette system is set up , making each act load its own palette (à la Knuckles' Chaotix), as well as a dynamic music system, allowing each act to load its own music.