: If you own the Steam version, you can find it by browsing local files to the uncompressed ROMs sub-folder. Core Features of the Combined ROM

Thus, sonic-knuckles-wsonic3.bin was born. It allows emulators like Kega Fusion, Gens, or RetroArch to run the complete Sonic 3 & Knuckles campaign without needing to load two separate ROMs or simulate the lock-on menu.