In the combined game, collecting the initial seven Chaos Emeralds during the Sonic 3 segments unlocks "Super" forms. Once you transition to the Sonic & Knuckles stages, you gain access to the Special Stages for the hidden Palace, transforming your Chaos Emeralds into Super Emeralds.
In a standalone Sonic 3 game, collecting all 7 Chaos Emeralds unlocks Super Sonic, Super Tails, or Knuckles' Super form. Once you enter the Sonic & Knuckles portion on a combined ROM, those Chaos Emeralds are locked away in the Hidden Palace. sonicknuckleswsonic3 bin file better
If you just want one .bin file to double-click, find a , but know it’s not original hardware-accurate. In the combined game, collecting the initial seven