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Sonic 3D Blast, known as Sonic 3D: Flickies' Island (ソニック３Ｄ フリッキーアイランド, Sonikku Surīdī Furikkī Airando?) in Japan and Europe, is an isometric platform game and the second 3D game in the Sonic the Hedgehog series, after Sonic the Fighters. It was developed in the United Kingdom by Traveller's Tales and published by Sega. Primarily developed as the last Sonic game for the Sega Genesis, it was later ported to the Sega Saturn and Microsoft Windows, and later re-released on many compilations and digital distribution platforms as well.

A separate game, titled Sonic Blast, was also released for the Sega Game Gear in the same year. However, much like the Game Gear versions of Sonic the Hedgehog and Sonic the Hedgehog 2, they are similarly titled but decidedly different games.

Sonic 3D: Director's Cut is a hack of Sonic 3D: Flickies' Island made by Jon Burton, founder of Traveller's Tales and the game's original programmer, with the goal of expanding the game with new content to increase replayability and to fix long-standing issues that the game has been criticized for. The project was first announced on Jon Burton's YouTube channel, GameHut, on October 12, 2017, and update videos were uploaded on a basis.

A public beta test was released as an expo entry during the 2017 Sonic Hacking Contest for players to try out the game and report bugs or suggest times for the new Time Challenge mode. The finished version was eventually released on December 23, 2017 as an xdelta patch and as a download on the Steam Workshop for owners of Sonic 3D on Steam.

Sonic 3D: No Flickies is a hack of Sonic 3D: Flickies' Island made by Sik. The game remains mostly unchanged; however, the Flicky collection system (part of the core gameplay of the original game) has been removed, allowing the player to complete the levels without needing to collect all the flickies in the level to advance. This makes it much more similar to traditional Sonic games, where the goal is to simply make it to the end of the level without dying.

This hack was later built upon further in the hack, Super Sonic in Sonic 3D, which was also created by Sik.

Sonic 4 in 1 is a compilation of Sonic 1, Sonic 2, Sonic 3, Sonic & Knuckles, and in addition allows you to also play Sonic 3 & Knuckles, Sonic 2 & Knuckles and the Blue Spheres minigame. The original idea for this came from Vladikcomper's Sonic 3 in 1. Since that hack only opted to include Sonic 1 to Sonic 3 due to limitations, I thought to make one better and prove all 4 games.

Credits:
Natsumi - Menu program, skeleton, game fixes, variable width font, custom Sonic Retro scripts & compatability
Flamewing - gen\_scalers (horizontal software scaler program)
GF ThePlayer - Main artist
VAdaPEGA - Art help (Sonic 1, Sonic 2)
ValleyBell - Sound driver help
Vladikcomper - Music, SSRG splash screen
Marc - Music, Sonic Retro splash screen
MarkeyJester - Animation
djohe - Testing
RedHotSonic - Testing

Sonic Achi is a hack based on Sonic 1 made By Natsumi adding new features.

Credits:
* Natsum
* Markeyjester
* ValleyBell
* djohe
* Egor
* Qiuu, Owarisoft
* Polly
* Shoe0nHead

Sonic & Knuckles (ソニック&ナックルズ Sonikku to Nakkuruzu?) is a 1994 platform video game in the Sonic the Hedgehog series for the Sega Genesis. It was developed in the United States at Sega Technical Institute by members of Sonic Team, and was published by Sega worldwide on October 18, 1994.

In addition to being a standalone game, through a system dubbed "lock-on technology," Sonic & Knuckles acts as an expansion pack to both Sonic the Hedgehog 2 and Sonic the Hedgehog 3, the latter with which it was developed in tandem.

"Blue Sphere" redirects here. For the video game in the Star Ocean series, see Star Ocean: Blue Sphere.

If the player uses the original Sonic the Hedgehog or Sonic Compilation, a screen with Sonic, Tails, Knuckles and Robotnik stating "No Way" repeatedly is displayed. By pressing the A, B and C buttons together, players can access a minigame based on the Special Stages of Sonic 3 and Sonic & Knuckles. Players can enter a twelve digit code on this screen, with every number combination generating a different variation of a Special Stage level. This game is retroactively known as Blue Sphere in Sonic Mega Collection.

Referred to in-game as Knuckles the Echidna in Sonic the Hedgehog 2, the game is largely identical to Sonic the Hedgehog 2, with the exception that gameplay is altered due to Knuckles having separate abilities from Sonic or Tails. Knuckles can glide and climb walls, allowing him to gain access to areas that had been otherwise hidden or unreachable. Conversely, he cannot jump as high, making some situations, such as certain boss fights, especially the final one, more difficult. In this version of the game, the two player mode has been removed.

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.

It's a Sonic the Hedgehog hack that includes Tails as a playable character, new/different layouts for every stage, different music ported from other Sega games, double boss fights in some zones and new moves!

sonic and tals in paynt is a parody hack of Sonic the Hedgehog 2 (and sequel to Sonic in Paynt) for the Sega Mega Drive/Genesis by sebmal (credited as "thehulk" in the hack.) In this sequel that is most likely wanted by nobody, you can expect even worse palettes, a soundtrack consisting entirely of the Hidden Palace Zone music, and poorly edited level layouts.

This hack is similar to the tongue-in-cheek hack Sonic 1337 by Ultima.

Sonic And The Mystic Gems (previously known as Sonic 1 Harder Levels) is a hack made by Eduardo Knuckles and his team Harder Project of Sonic the Hedgehog on the Sega Mega Drive. It began in 2005 with the simple purpose of being a generic Sonic 1 for Sega Genesis with increase difficulty and revamped versions of the original levels. But now, it's going to present a completely new gaming experience with a new style of level layouts full of paths everywhere among new enemies, new objects, new character abilities, new menus, completely different styles of the Sonic 1 special stages and much more!

Credits and Special Thanks

• Mistergambit for his Spring Yard Zone and Labyrinth Zone level art used in the game.
• Tweaker for his information regarding music importing, bug fixes and the speedcap removal.
• HPZMan for the new sound driver instruments and the dynamic tile-set system.
• Selbi for some new exclusive ASM things and improvements.
• Master3k for sending and fixing some music.
• nineko for creating the xm3smps tool which was essential for the creation of some songs. Special credits to him for the different songs per act system used.
• SCAA for their art.
• Puto for his tutorial to add Spin Dash.
• FraGag for his tutorial to fix the spike bug.
• SonicVaan for beta testing.
• HCKTROX for the lead programming and bug fixing.
• GenesisFan64 for the save screen menu, for some fixes related to the fade-out and others.
• MarkeyJester for lots of important code and a whole load of others.
• Irixion for beta testing.
• PsychoSk8r for his the dynamic palettes tutorial.
• Esrael for fixing essential things in the new sound driver.
• Prilix Bõkun for bug searching and beta-testing
• Estlib for various art stuff related to levels and for additional help with creation of gimmicks and objects
• DJ. Joker27 for his very big importance in specific level and misc music
• Mighty Arnold for additional support with beta-testing and level layout design

Kenny0989 for additional support in the music department Special credits to Harder Project's Team by all the useful exclusively things used in the project.

Sonic and the Secret Extended Edition (previously known as Sonic 1: The Other Extended Edition, not to be confused with Sonic the Hedgehog Extended Edition) is a hack of Sonic the Hedgehog for the Sega Mega Drive/Genesis by Hayate. It was discontinued in August 2008, after Hayate gave up on the hack due to the various bugs it had, but it was picked up again in December 2009.

Sonic Autumn Mix is a hack of Sonic the Hedgehog By USSR team.

The hack uses Russian language.

Sonic Back in Bime is a hack based on Sonic the Hedgehog made by EgorTF

The idea of this game is that you and another friend of yours selects a character (one being Sonic and the other being Tails) and you both battle it out to try to gain as many hits on Eggman. The catch is that Eggman only gets destroyed when the timer runs down to 0 (unless it's a draw at that time, then, it will wait for another hit). The player with the most hits at the end of the timer, wins! You can also win if the other player dies before the timer runs out. The amount of wins are tallied up on the results screen where you can either retry or change settings.

This hack made by redhotsonic

Sonic Boom is a total modification of Sonic 2, created by snkenjoi and iojnekns, along with a wide array of talented contributors. As of the Seventh Annual Hacking Contest, this collective is referred to as SÆGA.

Sonic CaDa is a hack of Sonic the Hedgehog by CamManS5.
This hack features, new music, new art, secret paths, and multiple end points in each level that offer different rewards. The Special Stages have been changed into Bonus Stages. There will be new Special Stages based on the 2D Special Stages found in Sonic Triple Trouble. Since the new Special Stages are not implemented yet, the Chaos Emeralds cannot be collected at this time without cheating.

Sonic CD Act 1

Sonic the Hedgehog hack made by By Narcologer

Credits:
Programming: Narcologer, Vladikcomper, Sonic2010, Esrael
New level art, new chunks and layouts: Narcologer
Sprites: Narcologer, The Spriters Resource, SCAA, Lone Devil
Music: Ivan YO, STD, Nineko