Sonic Forces Untold: Darkest of Days

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Tails and the Quest of 100 Rings is a fan game created by Magnus Andersson (aka mightydillo). A demo was initially released publicly with one zone in 1997. It was only the second Klik & Play Sonic-based fan game to ever hit the internet. A completed version was released in mid-1998. A demo for this game was released in the Sonic Klik & Play Collection.
2002, the year Sonic 2099 was released on Windows. Made and self published by TGF Team, this action game is available for free.

This is the PA series final Fan-game.

One day Big the Cat was going to fish on his favorite fishing river and he noticed that the river was polluted and all the fishes were gone! So he begin a quest to find the culprits and make justice

Sol Rush Misadventure is a visual novel about Blaze and Marine going on a treasure hunt on the quest to find the Achlysolis Blade, an ancient treasure hidden for generations. As Blaze and Marine go together solving various puzzles on their quest, they also build a closer bond to each other. Could this treasure have some link to Blaze's path? Can Marine convince Blaze about the thrill of adventure?

Join Sonic on a solo mission to defeat Doctor Robotnik as he tries to exploit the resources and populace of Jade Island in his bid for world domination! Stop Robotnik and find the chaos emeralds.

Stop Eggman's Control over the seasons on Eastside Island in Sonic Seasons!

Sonic the Hedgehog XA is an open-source fan-game inspired by classic Sonic games from the Sega Genesis. It was built from scratch by a single person using the C language and PSn00bSDK and a lot of tools and scripts created for the sole purpose of building this game. Sonic XA is a game that runs on the PlayStation 1, so to play it, you will need to use an emulator or burn the game to a proper CD-ROM so you can play it on your home console.

The game aims to combine multiple mechanics from various Sonic games to offer a fresh and unique gameplay experience!

Tales' Epic Gang is a 2D Sonic the Hedgehog Fan Game with cartoony graphics and wacky characters.