ROM Download for Genesis Sonic 3 and Knuckles. Related: sega genesis games sonic the hedgehog 3 sega genesis sonic and knuckles genesis sonic 3 genesis complete sonic and knuckles sonic 2 genesis sega genesis sonic 3 sonic the hedgehog 3 genesis sonic knuckles sega genesis lot sonic the hedgehog sega genesis streets of rage genesis. Sonic's been makin' the Sega scene in a big way in the last couple of months. Welcome to the next generation: Sonic 3 for the Genesis is the eagerly awaited next installment in Sega's saga of the feisty hedgehog and his arch-nemesis, Dr.