Knuckles the Echidna in Sonic the Hedgehog
Parent game
Sonic the Hedgehog is a 2D side-scrolling platformer developed by Sonic Team and published by Sega for the Genesis/Mega Drive. Players control Sonic the Hedgehog, who can run at near supersonic speeds and sets out on a quest to defeat Dr. Robotnik, a scientist who has imprisoned animals in robots and seeks the powerful Chaos Emeralds.
Could be interesting
What if Sonic Triple Trouble had been originally released on the Sega Genesis / MegaDrive, after Sonic 3 & Knuckles?
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!
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.
A Sonic fan game set in the SatAM universe.
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.
Sonic Advance Revamped is a remake and slight reimagining of the original Sonic Advance on the GBA, made from the ground up; a passion project designed to be the definitive way to play Sonic Advance! 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.
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.
A truly expansive Mario fangame based on Super Mario 64 that combines elements between it, Super Mario Sunshine, and Super Mario Galaxy. Released in 2009 and featuring 64 Shine Sprites and another 64 Star Coins to collect, it remains the largest-scale Flash-based Mario fangame to this day.
Crash N. Tense Adventure, a 2D Crash Bandicoot fangame, inspired by the original Playstation 1 Crash games. Exactly what you'd expect from a Crash game, single player classic platforming, collecting crates, wumpas and crystals, avoiding or attacking enemies with a spin move (not the Sonic variant), and then trying to beat your time in time trials.
Rayman Redemption is a reimagination of the original Rayman game from 1995. The features a lot of new content, including new worlds, levels, minigames and stuff to collect and complete.