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.

Super Sonic in Sonic 3D is a hack of Sonic 3D: Flickies' Island made by Sik. This hack allows the player to turn into Super Sonic in said game after collecting all sevenChaos Emeralds, mimicking its prequels Sonic 2, Sonic 3 and Sonic & Knuckles. The rules are borrowed from the latter two games, so the player must double jump to transform and also must not have a shield in that moment, besides the basic requirements (having all emeralds and 50 rings).All of Super Sonic's behaviour is implemented: a custom palette, a transformation pose with a fading palette, invincibility (with stars), speed shoes and a music change upon transformation. Rings drain while transformed as well. Super Sonic can still be killed by getting crushed by some falling platforms, however, so he isn't completely immune to death.This hack is based off Sonic 3D: No Flickies, and as such it shares the same gameplay rules.

Super Sonic in Sonic the Hedgehog is hack by Puto which adds the ability to turn into Super Sonic when obtaining all the Chaos Emeralds or using a button code. Although other people have incorporated Super Sonic into their Sonic hacks, this hack's main purpose is to add the ability to transform into Super Sonic. Super Sonic's abilities from Sonic 3 & Knuckles were added in addition to using the Super Sonic sprites of Sonic the Hedgehog 2.

Vector the Crocodile in Sonic the Hedgehog (aka Vector in Sonic 1) is a hack of Sonic 1 by E-122-Psi, starring Vector the Crocodile as the playable character instead of the blue hedgehog. The game is modified to use Vector's sprites (edited from Knuckles Chaotix) in place of Sonic's, along with several modifications to the player's stats and abilities.The game was modified by Sonic Retro member E-122-Psi, with additional programming and coding by other members including MarkeyJester and flamewing.

Yoshi in Sonic The Hedgehog 2 (by Xenowhirl), made based on the games Sonic the Hedgehog 2 and Yoshi's Island.The game brings several modifications, including new enemies and adaptations in the phases.