Sonic 3 Timelines SMS Remake

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Sonic SMS Remake

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 fanmade remake of Sonic the Hedgehog 2 for Sega Master System, featuring new characters and habilities, new zones and levels, a time attack mode, 3 red star rings per stage, a local wi-fi/lan multiplayer mode, a boss rush, Super transformations, internal memory card saving, 5 different endings, Big Rings to get the 7 chaos emeralds, a pause menu, a debug mode and cheats, new color palettes, gamepad support, 30 and 60 fps support, 4:3, widescreen and ultrawide.

A fanmade remake of Sonic the Hedgehog 1 for Sega Master System, featuring new characters and habilities, new zones and levels, a time attack mode, a local wi-fi/lan multiplayer mode, a boss rush, Super transformations, internal memory card saving, 5 different endings, Big Rings to get the 7 chaos emeralds, a pause menu, a debug mode and cheats, new color palettes, gamepad support, 30 and 60 fps support, 4:3, widescreen and ultrawide.
Could be interesting

Sonic Requeset is just your generic Sonic fan game.

A Sonic fan game set in the SatAM universe.

Sonic Advance Revamped is a remake and reimagining of the original Sonic Advance on the GBA using the Sonic Worlds Delta engine; it's a passion project designed to be the definitive way to play Sonic Advance, with better hazard placement, a 16:9 aspect ratio, patched-up levels and bosses, completely redesigned Special Stages, the smoothest sprites from each GBA Sonic title (with some special cases and custom sprites here and there), re-implemented unused/beta elements, and true classic Sonic controls to make the game feel even better. Features set for the future include an exclusive Team Chaotix Mission Mode, 8 Unique Playable Main Characters (7 of which are playable in this Demo), a fleshed-out Tiny Chao Garden, New Levels and Music Tracks, and more! For this particular Demo, Sonic's Insta-Shield is swapped-out for his Drop Dash! This move will be an early unlockable in the final version.

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.

Pikuniku is an absurdly wonderful puzzle-exploration game that takes place in a strange but playful world where not everything is as happy as it seems. Help peculiar characters overcome struggles, uncover a deep state conspiracy, and start a fun little revolution in this delightful dystopian adventure!

Sonic Outbound is a Sonic fan-game set one year after Sonic Mania's bad ending where Robotnik had the Phantom Ruby and Chaos Emeralds in possession. After the final battle in the core of the Titanic Monarch, Robotnik was stuck in Little Planet and started collecting the Time Stones and preparing his greatest plan yet.

A 2D Sonic the Hedgehog fangame made with Clickteam Fusion

The world is a chaotic, terrifying place, rife with all manner of monsters, warlords and hostile architecture. Even for the mighty Pachacamac clan, just the act of survival is a day to day struggle, and everybody seems to know that they can't keep it up forever. In pursuit of a safe home, a lone shaman named Ichima happens apon the Special Stage - and with it, a means of realizing their dreams of safety and peace...

A flash-based Sonic fighting fangame based on Super Smash Bros. franchise. It has some characters from Sonic franchise and a campagin mode.
The game is an attempt at a mini-crossover with Sailor Moon, in which characters from that universe can be summoned by Sonic and his friends as helper characters with the use of Chaos Emeralds. It takes on an 8-bit Sega Master System style and is designed to look as authentic to the system as possible (I think).