Restores the early versions of tracks that were changed for the final release, including the unused Hyper Sonic theme .

In the final Sonic 3 , you collect Chaos Emeralds via blue spheres. In Sonic & Knuckles , you collect Super Emeralds via a different mechanic. : Collect all 7 Chaos Emeralds in the first half of the game, then find giant rings in the S&K half to transform them into Super Emeralds—all with one save file.

Sonic 3C Delta - Updated Flying Battery Zone Parallax Scrolling

: Implements prototype-inspired level layouts, early graphics, and title screen art that were changed for the final retail release.

(Sonic 3C 1103), restoring early concepts, music, and layouts that were cut from the final retail release. Key Features & Changes Original Level Order : Restores the intended sequence where Flying Battery Zone

Delta 11 is the first stable build where Knuckles the Echidna is fully playable in Sonic 3 levels.

Speedrunners used a glitch where Knuckles could clip through walls by crouching and sliding at a specific angle. In Delta 11, the collision detection routine (specifically the subroutine at 0x0002A4E in the ROM) was patched, closing this exploit.