11 ((link)): Sonic 3c Delta

focus on creating the "definitive" polished version of the game, Sonic 3C Delta

Many stages feature early or alternative music tracks found in the prototypes.

When combined with —most frequently referring to Sonic 3A 1103 (the famous November 3, 1993 prototype) or major software updates like Version 1.1 —it marks a definitive effort to reconstruct Sega’s lost 1993 masterpiece. The History: Why Sonic 3 Was Split

: Integrates elements from the November 3, 1993, prototype and early Sonic 3C builds. sonic 3c delta 11

Original concepts for the story transitions between zones. Key Features in v1.1 / "Delta 11" Update

No emulator properly runs it. On real hardware, Delta 11 crashes after Angel Island Zone — unless you hold A + Start on controller 3 before the title screen. Then you hear a low, humming tone, and the screen reads:

Sonic 3C Delta 1.1 is an extensive ROM hack of Sonic 3 & Knuckles by that focuses on restoring content from early development prototypes (like the November 3, 1993 build) while maintaining the polish of a modern "complete" edition . 🕹️ Core Experience focus on creating the "definitive" polished version of

Have you encountered a cart that matches the Delta 11 behavior? Share your findings on the Sonic Retro forums.

Also, consider the tone. It should be respectful of the official franchise while highlighting the creativity of fans. Balance between praising fan work and acknowledging the risks or challenges they face.

: Where the hack has been showcased for user convenience. Original concepts for the story transitions between zones

Super Sonic can throw rings, a feature originally found in the early Sonic 3 prototype code.

Delta 11 introduced three unused level layouts, an early version of the elemental shields with different physics, and a peculiar glitch where Sonic’s sprite would phase through solid ground if you spun at exactly 11 frames per second. Playtesters called it “the ghost run.”

: Includes the three original bonus stages alongside refined layouts for prototype-inspired Sonic & Knuckles zones.

To experience this piece of Sonic history, you will need a few basic digital tools: