Sonic Delta

Introduction: Sonic Delta is an ambitious Genesis / Mega Drive ROM-hacking project by Esrael Neto that combines material from multiple classic Sonic games and prototype-era content into one very large cartridge image. It is not simply a Sonic 3 & Knuckles restoration hack.

Gameplay & Mechanics: The project draws on content from Sonic 1, Sonic 2, Sonic 3, and related prototype or cut material, placing a large amount of classic Sonic content into a single ROM. Its technical scale is unusual for a Genesis hack and newer builds require emulator support for the Sega mapper because the ROM exceeds the normal 4 MB address space.

Key Features:

• Combines stages and content inspired by multiple Genesis-era Sonic games.
• Includes prototype, restored, and previously unused material alongside familiar stages.
• Uses an unusually large ROM and Sega mapper support in modern builds.

Sonic Delta is best understood as a large multi-game compilation and restoration project, not as a Sonic 3 & Knuckles hack centered on the Drop Dash or mid-act save features.