The most reliable way to obtain a compatible Sonic_Knuckles_wSonic3.bin file is through official SEGA releases. Even though individual listings have changed, you can still find the ROM within:
While Sega has delisted the SEGA Mega Drive & Genesis Classics from Steam, users who previously purchased it can still find their legitimate .bin file: sonic 3 and knuckles bin download hot
Here’s the long-form article:
This guide is for informational and educational purposes only. Downloading copyrighted ROMs may violate laws in your region unless you own the original game and are creating a backup. Always support official releases where available. The most reliable way to obtain a compatible