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Sonic 3 & Knuckles uses a unique sound driver that switches between two Z80 banks. Many "quick patch" ROMs cause the music to desync during the transition from Angel Island Zone to Hydrocity Zone. The correct merged .bin maintains the proper tempo of the "Competition Menu" theme and prevents the Drive Zone's bassline from dropping out.
Except it wasn’t normal.
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| If you want… | Best .bin choice | |--------------|------------------| | Original Sega experience | Lock-on using Sonic 3 (U).bin + S&K (U).bin in emulator | | Convenience (single file) | Merged Sonic 3 & Knuckles (U) [h].bin | | Best bug fixes & features | Sonic 3 Complete (IPS patch + original S3&K .bin) | sonicknuckleswsonic3 bin file better
Summary
It was a door. A giant, red lock-on cartridge slot. Above it, the words: This public link is valid for 7 days
The "sonicknuckleswsonic3.bin" file is widely considered the definitive way to play Sonic the Hedgehog 3 & Knuckles on modern platforms. This specific binary file is the uncompressed ROM found within the collection on Steam.