The game was originally prototyped as Sonic Crackers , a tech demo for the Genesis that experimented with two characters tethered together. In Chaotix , this concept was fully realized via a "Combi-Ring." You control two characters simultaneously (or one player and a CPU partner). They are linked by an elastic tether.
Knuckles' Chaotix is often called the "black sheep" of the Sonic series. Several factors have prevented a modern re-release: knuckles chaotix pc download
If you're looking for similar games to play on PC, you might enjoy: The game was originally prototyped as Sonic Crackers
I notice you're asking for a PC download of Knuckles' Chaotix (a 1995 Sega 32X game). While I can’t provide or link to ROMs or downloads (due to copyright), I can give you a that exists in fan projects and emulators for the game: Knuckles' Chaotix is often called the "black sheep"
Since there is no native Windows version of the original game, the most common way to play it on a PC is through a Sega 32X emulator. This method allows you to experience the game exactly as it appeared in 1995, complete with the unique rubber-band physics and vibrant sprite art.
. Since its original 1995 release for the Sega 32X, the game has only been briefly re-released once via the now-defunct subscription service in the mid-2000s.