30 Years Later, Sega's Strangest Hardware Innovation Still Seems Just As Wild
Briefly

Knuckles the Echidna was intended for Sonic 3, but due to timing, Sega creatively split the game, leading to a unique cartridge experience with lock-on technology.
Sonic & Knuckles remains memorable not for its gameplay alone, but for its strange, innovative cartridge design that allowed it to connect with other games.
The bulky Sonic & Knuckles cartridge, with its unique flap and lock-on feature, transformed gameplay, allowing Knuckles to be playable in Sonic 2.
The innovative concept of 'lock-on technology' not only enhanced Sonic & Knuckles but also created a new experience by integrating with earlier Sonic titles.
Read at Inverse
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