This article pertains to the beta elements of Sonic the Hedgehog 3 & Knuckles.
Unused objects
All of these unused objects that have been present in Sonic the Hedgehog 3 and Sonic & Knuckles are still found in the game's files.
| Artwork | Name | Description |
|---|---|---|
 |
Button | A button with unknown purpose. It can be placed in Carnival Night Zone via Debug Mode but does nothing when pressed. |
 |
Breakable block | This block glows and is breakable by jumping on it. It can be placed in IceCap Zone via Debug Mode. |
 |
Lift | A platform that is not used in any level. Its graphics match Launch Base Zone. It has no movement of its own. |
Unused audio
Music
These songs can be heard in the Sound Test.
| Clip | Sound ID | Description |
|---|---|---|
| $26 | The credits theme for Sonic the Hedgehog 3. It was replaced with the Sonic & Knuckles credits theme instead. | |
| $32 | A short "Game Clear" jingle from Sonic the Hedgehog 3, which is not heard in the lock-on game. A longer version of this jingle can be heard at the end of the credits medley. |
Sound effects
Sounds from Sonic the Hedgehog 3 still exist in this game.
| Clip | Sound ID | Description |
|---|---|---|
| $3A | A shield sound leftover from Sonic the Hedgehog 2. | |
| $40 | An electric zap. This sound would later be used for the Thunder Shield in Sonic Generations and Sonic Lost World. | |
| $5A | Sounds like something revving up. It would later be used in Sonic 3D Blast. | |
| $6B | Sounds like a higher-pitched version of the sound heard when hitting an R, Up or Down block in the Special Stage from the original Sonic the Hedgehog. | |
| $6D | Sounds like a door closing. | |
| $71 | Duplicate of $3A. | |
| $7D | Sounds like mild rattling. | |
| $84 | Sounds like something charging up. It only seems to be referenced in some Zone with a high level ID which is composed of garbage data. | |
| $85 | This would have been used in cooperation with $84. | |
| $8D | A very quiet sound. | |
| $8E | Another electric rev-up sound. | |
| $99 | A small "tick" sound. | |
| $A1 | A low-humming sound. This sound effect is used by the Stardust Speedway Zone Act 1 boss in Sonic Mania. | |
| $A5 | Sounds like something rising or powering up. | |
| $A6 | A dashing noise. | |
| $B5 | The sound effect of the breakable diamonds in the Special Stage from the original Sonic the Hedgehog. | |
| $BC | ||
| $C5 | ||
| $D1 | A very faint sound that may sound like static. | |
| $D6 | Some sort of rumbling/electric sound. | |
| $D8 | Sounds like a screeching warning siren. It was used in the November 3rd, 1993 prototype when Robotnik appeared behind the trees at the end of Angel Island Zone Act 2. | |
| $DD-$DF | Sounds of duplicates for $DB when running across water in Hydrocity Zone. |
