Sonic the Hedgehog 3 and Sonic & Knuckles were originally to be released as one game,[4] but due to time and financial constraints, it was later split into two separate games. However, Sonic & Knuckles contained "Lock-on Technology", where the Sonic & Knuckles cartridge would be put in the Sega Genesis system, and then another game could be placed onto the top of the Sonic & Knuckles cartridge itself.[4] When Sonic 3 is used in this manner, it enables the player to play through both games as one, titled in-game as Sonic 3 & Knuckles. This features several additions to the games not available otherwise, such as small alterations to the levels, and being able to play through Sonic 3 levels as Knuckles, or Sonic & Knuckles levels as Tails, and the ability to save progress in all of the game's levels.Additionally, this was the only way to collect Super Emeralds, which are earned by accessing Special Stages in the Sonic & Knuckles levels after collecting all seven Chaos Emeralds from Sonic 3. When all Super Emeralds have been collected, Sonic, Knuckles and Tails can transform into Hyper Sonic, Hyper Knuckles and Super Tails respectively, each with unique abilities.

This hack based on Sonic 1, This game plays like Sonic 1 but with the speed of Sonic 2 with CD abilities. Like CD it promotes exploration, collecting stones will reward you and also give you good futures automatically. New special stages in the future. This will not be the final build, however I intend to get it playable and presentable for the contest. Thanks for checking out my entry!.Credits:Selbi - CD CameraNatsumi - Beta testerDandaman - Beta TesterSSRG community - Feedback and Suggestions Abyss

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.

Toei Sonic 3 & Knuckles is a Sonic 3 & Knuckles hack which adds Sonic based on the Sonic CD opening. Made by The One Musaab.

In short, Eggman wants to destroy Sonic, and, well, Sonic just won't have that, and it's up to you to stop him.Currently, I have GHZ and the first two acts of MZ finished in time for the contest. I kinda rushed it to the finish so you should expect some anomalies here and there.This hack made by Bagumba

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.