The customizer allows you to toggle a wide range of features to create your "definitive" version of the game: :

Choose whether to keep the classic "200 rings = 1-up" mechanic or remove it.

: Use the older Sonic 3 sound effects for things like invincibility or extra lives. Gameplay & Mechanics :

Gives access to various, previously inaccessible, game modes. What is the Sonic 3 Complete Customizer?

The crown jewel of this project is the . This powerful tool allows players to tweak almost every aspect of the game, tailoring the aesthetics, gameplay, and audio to their exact preferences. This comprehensive guide covers everything you need to know about utilizing the customizer to create your perfect Genesis-era Sonic experience. What is Sonic 3 Complete?

The customizer has offered options to add "& KNUCKLES" branding to the title screen and ending, as well as the ability to force the game to load specific sprite variants for Sonic, Tails, and Knuckles beyond the default configurations.

physics, toggle the "Insta-Shield," or enable the "Drop Dash" from Sonic Mania

Locate and run the file named customizer.exe . Note that this is a Windows-based tool; while compatibility layers exist for other systems, native Windows is the primary environment.

The range of available toggles in the classic Customizer illustrates just how deeply the hack explores the game's code. While many of these options have since moved to the in-game menus, the external tool was the original home for some of the most significant changes. Here are some of the most notable options historically available:

Select which mid-boss music plays, allowing you to prioritize the Sonic 3 theme over the S&K theme.