The is a proprietary game engine created by Christian Whitehead. It was famously used to power the mobile "widescreen" remasters of Sonic the Hedgehog 1 , Sonic 2 , and Sonic CD , as well as the critically acclaimed Sonic Mania .
collection for years, the community developed several alternatives: Sonic 3 in RSDK (Sonic 3 '14 Project) Sonic 3 in RSDK (Sonic 3 '14 Project) Sonic Central
: The POC featured native widescreen, smooth transitions between acts, and remastered sprites. Sonic 3 Rsdk
The primary challenge of the project was the disparity in source code. Sonic 3 & Knuckles was originally written in Motorola 68000 assembly language. Assembly is low-level code that speaks directly to the hardware of the Sega Genesis. You cannot simply copy-paste assembly code into a modern PC game; it must be completely rewritten.
Features a fully functional Lock-On Blue Spheres game and a recreated title screen. Project Status and Technical Details Retro Engine (RSDK) The is a proprietary game
This led to official RSDK remasters of Sonic 1 and Sonic 2 for mobile devices.
To create a new level:
However, a more literal Sonic 3 RSDK project does exist: a fan recreation using the actual Retro Engine (version 4 or 5) extracted from the mobile Sonic 1 and 2 APKs. This is sometimes called or S3RSDK .