*Flying Battery shows up with its unused ''Sonic 3'' icon in Data Select. *The Continue screen uses title card-style text as it did in ''Sonic 3'', rather than end credits-style text as it did in ''Sonic & Knuckles''. (The background color is white rather than grey.) *The Special Stage results screen for Chaos Emerald stages is now styled much more like the version from ''Sonic 3'' alone. Player 2 can press a button to make him appear. **In a Sonic and Tails game, Tails does not appear for the final Launch Base bosses. **The ability to hit characters out of their super form has not been reintroduced. *Sonic/Tails have their final Launch Base 2 boss restored, with its ''Sonic 3'' sweeping behaviour. *Credits music has been replaced with the ''Sonic 3C'' prototype 0517 version. *Act music no longer resumes after the Got Through screen before a zone transition. *Music no longer fades out before the Got Through screen *''Sonic 1-3''-style monitor behaviour - jumping under the base of a monitor will make it fall. **Knuckles' routes in these layouts were incomplete, but additions have been made to allow them to be played through. *Many of the ''Sonic 3'' levels use their original ''Sonic 3'' object layouts by default, most notably Hydrocity 2 and Launch Base.

**The ''Blue Sphere'' difficulty screen now plays the Gumball Bonus music. **The ''Sonic 3'' credits music plays during the ending before the main credits begin (replacing Sky Sanctuary) **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

Sonic 3 and knuckles bin rom