A hack based on Sonic 1 made by Ashuro.Credits:-MarkeyJester, for his ASM tutorials and helps.-FireRat, without him, which things would not have been possible.-FraGag, my Canadian neighbor who helped me to better understand the asm (because he speak French).-GenesisDoes, who helped me to understand how to import and work with objects in a rom.-ValleyBell, without him, which i could never make my own smps songs.-Natsumi, TheStoneBanana, StephenUK, PacGuy for being patient with me on the "Basic questions & answer thread".-Clownacy, a great moderator, thank you for the helps.-A-S-H, to improve me in my SMPS work.-Frenzy-Frenzless, my AFTERLIFE partner, who helped me to find gameplay ideas.-Mercury, because its ReadySonic open-source helped me to translate Github's ASM to Hivebrain 2005.-RedHotSonic, to have tested my previous rom-hack and helps.-ProjectFM for many things like some music and asm help.

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 2 XL is a hack of Sonic the Hedgehog 2 for the Sega Mega Drive/Genesis by Captain Bozo and Ranger. Rings are replaced with onion rings, and Sonic becomes fatter after eating them.

Sonic the Hedgehog 2: Pink Edition is a character swap hack of Sonic the Hedgehog 2 for the Sega Mega Drive/Genesis, with Amy Rose and Cream the Rabbit replacing Sonic the Hedgehog and Tails respectively. Amy Rose's sprites are designed after her modern look. Amy Rose with classic-style sprites is available to play in the Amy Rose in Sonic the Hedgehog 2 hack. The game was modified by Sonic Retro Member E-122-Psi, with additional programming and coding by other members including MarkeyJester, MainMemory, FraGag, Selbi, and Hayate. Most programming unique from Amy In Sonic 2 such as Cream the Rabbit's gameplay was implemented by Flamewing.

Sonic 3 Complete is a hack of Sonic 3 & Knuckles which aims to provide a much improved variant of the original game, with many new options and features, without straying from the original levels or gameplay. The inclusion of separate modes for Sonic 3, Sonic & Knuckles and Blue Sphere also make this a close cousin of the PC compilation Sonic & Knuckles Collection, albeit designed for the original 16-bit hardware.

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.