**Hidden Palace plays ''Sonic 3'' miniboss for Knuckles fight, ''Sonic & Knuckles'' miniboss for Emerald theft. **Flying Battery 2 sub-boss plays the ''Sonic & Knuckles'' miniboss theme. **Marble Garden 2 boss for Knuckles plays the standard zone boss theme. *Various music cues are flipped around to work with this: *Tracks for title screen, invincibility, Knuckles' theme, miniboss, 1UP, ''Sonic 3'' ending, continue/race results, and data select are the ''Sonic 3'' versions by default. Additional menu options and ROM patches are available to reverse some of these changes, or make others, to provide a version to match the player's own preference.
It also contains bugfixes and other additional features, and provides versions of Sonic 3, Sonic & Knuckles and Blue Sphere with these same additions and fixes, essentially providing a console version of Sonic & Knuckles Collection. It began primarily as an alteration of the musical configuration of that game to to more closely resemble that of the original Sonic 3. Sonic 3 Complete is a hack of Sonic 3 & Knuckles. Additional contributions from flamewing, That One Jig, Neo, Hayate, shobiz, Tribeam, MoDule and LOst