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: The downloaded file might be in a ZIP or RAR format. You'll need software like WinRAR or 7-Zip to extract it. After extraction, you should have a .bin file.
To play the Sonic & Knuckles & Sonic 3 bin file on your computer, you'll need an emulator. Some of the most popular Genesis emulators include:
: A backup of the specific Steam ROM has been hosted on the Internet Archive.
Back in 1994, Sega released Sonic the Hedgehog 3 and Sonic & Knuckles as two separate cartridges. However, the Sonic & Knuckles cartridge featured unique "Lock-On Technology." By plugging the Sonic 3 cartridge into the top of the Sonic & Knuckles cartridge, players unlocked the full, unified game Sega originally intended to release.