Since the game is considered "abandonware" by many, it is available through digital preservation sites, though the most stable way to play it on modern systems is using community patches.
To make the game run on Windows 10 or 11, download the Sega PC Reloaded launcher from GameBanana. This tool fixes speed issues and adds modern compatibility. Installation Steps: Sonic & Knuckles Collection PC Download Free To...
Select "Install Game," point it to your game folder, and choose a new location for the patched installation. Since the game is considered "abandonware" by many,