Jamie Bailey

Sonic The Hedgehog: Time Attacked is a 2003 fan game made by Jamie Bailey. Time Attacked has been compared to commercial games released by Sega because of the game's detailed original graphics and the author's vast knowledge of Clickteam based programming. Dr. Eggman has invented a time machine and uses it to go back in time to defeat Sonic following a failed attempt. Eggman succeeds and begins to create a paradox, causing the present-time Sonic to fade. Once he realizes what's going on with him, he sets off to stop Eggman before he completes the paradox and changes made in time are permanent.

Sonic eXtended Genesis, aka Sonic XG, is a Sonic fangame created by Euan "Sir Euan" Gallacher and Joseph "Nitemare" Waters, and has gone through many different variations in the past. Its most recent build was released on August 17th, 2023.

Headcannon

Sonic the Hedgehog: Project Mettrix is a fan game led by Stealth, created using his own E02 Headcannon Game Engine. This platform makes this game available to DOS, Windows, Linux, MacOSX, PSP (CFW), and Wii (Homebrew Channel) users, and has allowed a significant amount of mechanical evolution from the game's earlier incarnations.

BlueFrenzy

Sonic Frenzy Adventure is a retro-style fangame developed since 2004, featuring 11 zones and 5 playable characters, including two original ones. The game introduces unique mechanics such as a revised ring system with four levels, various shields with passive effects, and special powers exclusive to Sonic. Players explore each zone, ending in a boss fight, with a storyline focused on defeating EggRobo's mechanical empire. Achievements track high scores and hidden collectibles, and the game offers character-specific routes and challenges.

Clwe

BlazeHedgehog

Chaos Control, GagaGames

Showoff Team, Beaveration

Coldflame Productions

Nik Jam

Shadow Team

Myst Hedgehog

Dario Interactive

Sonic Revitalized 3D

Boodles

The sniper gets a game all of his own, mixing many elements such as shooter, puzzler and platformer

Kulock

Shadow Team

The game is Shadow's own Adventure, with the resurrection of Professor Gerald Robotnik, learning about a counter part to Chaos from Sonic Adventure 1, Destructo. Learning this, Shadow must take Gerald out.

Chaos Team (Fangaming)

Chao Killer Team

Shadow Team

ESS Software

Chronic Team

SupaChao

Sonic Team Brasil

Lightning the Hedgehog