The original Sonic & Knuckles cartridge was a marvel of engineering. It featured a unique slot on top where you could plug in other game cartridges, most notably Sonic the Hedgehog 3 . When combined, the Sega Genesis didn't see two separate games, but .
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It was a door. A giant, red lock-on cartridge slot. Above it, the words: The original Sonic & Knuckles cartridge was a