>>11940130 (OP)
3&K should always be combined like was intended from the start. It doesn't have that feature for nothing. It was intended to be one game but they split it and came up with the connecting cartridge compromise due to time constraints. With that in mind, it is undeniably the best Sonic game. Then I guess Sonic 2 and Sonic 1. The Game Gear games and CD can fuck off I don't care.
Sonic 3&K is the greatest 2D platformer ever made.