Locking them together merges both games into one 14-zone epic that flows naturally from the crash of the Death Egg in Sonic 3 to the heights of Sky Sanctuary in Sonic & Knuckles.
Visually, it is arguably the most impressive title on the Sega Genesis, featuring detailed spritework and complex parallax scrolling. The soundtrack is equally iconic, famously involving contributions from and his team, though this has led to licensing complications in modern re-releases. Community Perspectives Sonic and Knuckles & Sonic 3
The standout feature is the physical , where you could plug the Sonic 3 cartridge directly into the top of the Sonic & Knuckles cartridge. Locking them together merges both games into one