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Back in 1994, Sega released Sonic & Knuckles with a unique "Lock-On" cartridge technology. By plugging the Sonic 3 cartridge into the top of the Sonic & Knuckles cartridge, players unlocked the full, intended experience: a massive game featuring all levels from both titles, the ability to play as Knuckles in Sonic 3 , and the "Super Emeralds" for Hyper transformations. sonicknuckleswsonic3 bin file download link
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