Sonic the Hedgehog Genesis (Genesis) is a hack of Sonic the Hedgehog by Xenowhirl which attempts to recreate certain aspects of the Game Boy Advance Sonic 1port titled Sonic the Hedgehog Genesis.

Sonic the Hedgehog Megamix (commonly shortened to Sonic Megamix) is a work-in-progress multiperson disassembly modification of the original Sonic the Hedgehog videogame for the Sega Mega Drive / Genesis, developed by Team Megamix and more recently moved to the Sega Mega-CD. The game features the ability to play as one of five different characters: Sonic the Hedgehog, Mighty the Armadillo, Shadow the Hedgehog, Miles "Tails" Prower, and Knuckles the Echidna. It is an extensive reworking of the original game, featuring new art, music, abilities, layouts, and other things.

Sonic ReOne is a hack created by DeltaWooloo which takes Sonic back to where he originally started 29 years ago in South Island. This hack features new palettes that cycle through every act just from bright morning to dark evenings. Iconic features from classic Sonic games arrived in this hack (see the features below) Eggman pumped up his bosses to make it harder when you annoy him by hitting him. The level design is a mix between linear and platforming which is something you see in Sonic games, but be careful that you don't go too fast. Eggman placed badniks and springs to prevent you from going to the end. The music is catchy and fun to listen to and suits the mood of the zones.CREDITSLevel designs: DeltaWooloo with some help from Dj. Joker27Music composers: Dj. Joker27, RuthlesstheHooman, TheInvisibleSun and JoenickROS, LackofTrackPalette designers: DeltaWooloo, RuthlesstheHooman, maple_t and KCEXECoders: DeltaWoolooand RandomNameTitle Screen logo made by mePeople who helped me along the way: Iso Kilo, AUORA_FIELDS (Natsumi), MarkeyJester, Samey, ProjectFM, Tanman Tanner, Trickster, Inferno, RuthlesstheHooman, nineko, KCEXE and Dark LipsSpindash guide by Lightning, Puto, shobiz, MecuryShield attract and bug fixes from Mecury's ReadySonicPeelout and CD spindash by LuigiXHero and MecurySonic CD roll jump and slow ducking, title screen centering and fix Sonic 1 debug by Iso KiloFade to white routine and removing water surface object by ProjectFMAir roll by InfernoSonic 2 spring object, coconuts and stars by RandomNameCorrecting PAL music by CrashStarposts by ShooterSonic 3 and CD SFX: KCEXERoute 113 SMPS by ProjectFMSnake Man SMPS by ValleyBellSonic Heroes Special Stage 2 by S_T_DA few bug fixes and Nemesis and Kosinski decompression by vladikcomper