Sonic & Knuckles + Sonic the Hedgehog 3 (World) ROM < Genesis ROMs

The concluding sequel to Sonic the Hedgehog 3, and the only Sega Genesis game to feature lock-on technology (allowing players to play as Knuckles in Sonic the Hedgehog 2 and the ability to combine it with Sonic the Hedgehog 3 into one big adventure).

Lock-on technology, Sonic Wiki Zone

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