If you do not own the Steam version, common "hot fixes" or workarounds used by the community include: Renaming Existing ROMs: Many users take a standard Sonic 3 & Knuckles ROM and rename it to Sonic_Knuckles_wSonic3.bin
Navigate to your Steam library folder: C:\Program Files (x86)\Steam\steamapps\common\Sega Mega Drive Classics\uncompressed ROMs\ sonic knuckles wsonic3bin file download hot fix
to satisfy the requirements of installers like Sonic 3 A.I.R.. Community Links: If you do not own the Steam version,
...\Steam\steamapps\common\Sega Classics\uncompressed ROMs\Sonic_Knuckles_wSonic3.bin sonic knuckles wsonic3bin file download hot fix
: If you only have separate ROMs for Sonic 3 and Sonic & Knuckles , you can manually create the combined .bin file using a command line tool: