Games like Sonic Advance Revamped
Pikuniku
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 Triple Trouble 16-Bit
What if Sonic Triple Trouble had been originally released on the Sega Genesis / MegaDrive, after Sonic 3 & Knuckles?
Chapter Zero: The Angel Island Saga
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...
Sonic the Hedgehog Moon
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).
Sonic Smash Brothers
A flash-based Sonic fighting fangame based on Super Smash Bros. franchise. It has some characters from Sonic franchise and a campagin mode.
Sonic Spectre
A 2D Sonic the Hedgehog fangame made with Clickteam Fusion
Sonic World DX
Sonic World DX is a Heroes-style fangame with over 15 playable characters and 10 unique stages!
Sonic the Hedgehog 3D
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 Requeset
Sonic Requeset is just your generic Sonic fan game.
Sonic the Hedgehog Transitions
A Sonic fan game set in the SatAM universe.