# Sonic CD Decompilation

> Sonic CD Decompilation is the RSDKModding decompilation of the Retro Engine v3 behind the 2011 Sonic CD remaster, for Windows, Linux, macOS and Android.

Web page: https://emulationking.com/sega/segacd/games/soniccd/ports/soniccddecompilation/
Page updated: 2026-09-30

- Developer: RSDKModding
- Port type: Decompilation (The game's code was rewritten by hand as source code that builds back into the same game, then made to run natively on PC.)
- Game: [Sonic CD](https://emulationking.com/sega/segacd/games/soniccd/index.md)
- AI use: Not stated
- Source code: https://github.com/RSDKModding/RSDKv3-Decompilation
- Runs on: Windows, Linux, macOS, Android

What you need: `Data.rsdk` from the 2011 remaster of Sonic CD, from your own copy; the FMV cutscenes need the files from the original Steam release.

Sonic CD Decompilation is a native port of the 2011 remaster of Sonic CD by Christian Whitehead, made by the RSDKModding team by decompiling the Retro Engine v3 that runs it, for Windows, Linux, macOS and Android.

It adds a built-in mod loader and API, support for the updated mobile scripts with features the official PC version never had, and debug features ported from Sonic Mania. The decompilation is complete and the game is playable from start to end. The FMV cutscenes only work with the files from the original Steam release.

The download contains no game data. It needs `Data.rsdk` from the 2011 Sonic CD remaster, from your own copy.

## How to set it up

1. Download the build for your system and extract it. The Android zip holds the APK to install.
2. Copy `Data.rsdk` from your own copy of the 2011 Sonic CD remaster into the folder with the executable.
3. For the opening and ending videos, also copy the `videos` folder from the original Steam release.
4. Run the executable. Settings are kept in `settings.ini` next to it.

## Latest builds

Download these from the web page: https://emulationking.com/sega/segacd/games/soniccd/ports/soniccddecompilation/#download

- for Windows: 1.3.3 (2025-11-02)
- for Linux: 1.3.3 (2025-11-02)
- for Android: 1.3.3 (2025-11-02)
- for macOS: 1.3.3 (2025-11-02)