The customizer allows you to toggle a wide range of features to create your "definitive" version of the game: :
Before diving into the Customizer, it helps to understand the base project. Sonic 3 Complete is a patch for the original Mega Drive/Genesis ROMs. It combines Sonic the Hedgehog 3 and Sonic & Knuckles exactly as the developers originally intended before time and budget constraints forced them to split the game into two separate cartridges. sonic 3 complete customizer