Sonic Advance X
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Retro Sonic was a fan game project by Christian "The Taxman" Whitehead which would, later on, become the Retro Engine.
What if Sonic Triple Trouble had been originally released on the Sega Genesis / MegaDrive, after Sonic 3 & Knuckles?
Sonic the Hedgehog 3D is a free fan game about a famous SEGA mascot, Sonic, and it is made on Build Engine with additional EDuke 32 port. The game was inspired by two classic Sonic series: Mega Drive/Genesis and Sonic Adventure series.
Sonic the Hedgehog Classic is a fan game by Hez. It began as an offshoot of his earlier fan game Sonic 1 PC, with a variety of new levels. The game will allow users to play as three characters—Sonic, Tails, and Knuckles—and possibly a custom character of their own. The game features elements from the classic Mega Drive games, as well as new gimmicks. The game currently uses the MMF engine for Windows and has had three releases, with the latest revision (see Downloads) fixing some issues reported by players of the previous version. Moreover, it is Sonic Retro currently being converted to a hack for the Mega Drive by StephenUK. Finally, a few months after releasing the game, Hez Sonic Retro announced that he had started working on its sequel Sonic Classic 2, whose features include various new power-ups and level elements and a complete original soundtrack by Karl Brueggemann.
Sonic Classic 2 is a 2D fangame that is a sequel to Sonic Classic by Hez which will include: Brand New Levels 4 playable characters (Sonic, Tails, Knuckles, and Fang) New unique gimmicks Customizable shields SC1 revamped levels Online Play Extras & More!
Web browser game based on the special stages of Sonic 3D Blast used for contests on the Sega website.
A fanmade remake of both Sonic the Hedgehog Chaos and Sonic the Hedgehog Triple Trouble for Sega Game Gear, featuring new characters and habilities, new zones and levels, red star rings to unlock new stages, blue spheres special stages, Time Stones, a 16 bit music mode, a hub world, Ultra transformations, a pause menu, a debug mode and cheats, new color palettes and new player camera, gamepad support, 30 and 60 fps support, 4:3, widescreen and ultrawide.
A 3D Sonic fan game developed by Possqueen and a few friends.
Sonic - Project Hero is a 3D Sonic fangame & custom, closed source framework, made for the Unity game engine and developed by Hero. It aims to launch Sonic, Tails & Knuckles into, simply, a fun 3D adventure through various locales, to stop Dr. Eggman's new scheme. The game aims to introduce new and unique mechanics and mix-n'-match existing ones from the Sonic series, in order to create a fresh experience.
A Sonic fan game set in the SatAM universe.