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

A challenging puzzle platformer inspired by games like Limbo and Badland.

Forgotton Anne is a 2d cinematic adventure game combining puzzle platforming with adventure game elements. You play as Anne, the enforcer keeping order in the Forgotton Realm, as she sets out to squash a rebellion that might prevent her master, Bonku, and herself from returning to the human world. The World of Forgotton Anne: Imagine a place where everything that is lost and forgotten goes; old toys, letters, single socks. The Forgotten Realm is a magical world inhabited by Forgotlings, creatures composed of mislaid objects longing to be remembered again.

Planet Alpha is an adventure set in a living alien world where you have the ability to manipulate the daytime. To survive on this strange planet you will have to be observant of how the environment and the wildlife behaviour changes depending on the time of day.

Semblance is an innovative platformer with deformable terrain, set in a beautiful minimalist world. It’s a game that asks, what if you could deform and reshape the world itself? Semblance takes the idea of a ‘platform’ in a platformer and turns it on its head.

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!

2D platform game with classic platform gameplay, deadly traps, dark storyline and unique hero abilities, all in Tim Burton's-like audio-visual.

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.
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).

A Sonic fan game set in the SatAM universe.

Sonic Requeset is just your generic Sonic fan game.