What is Sonic CD Sega Dreamcast Port?

Sonic CD Sega Dreamcast Port is an open-source port of Sonic CD. An existing game or its source code brought to another platform. The original game ran on Dreamcast.

Do I need the original game files to run Sonic CD Sega Dreamcast Port?

Yes. The project does not include the original game's assets, so you need your own copy.

Sonic CD Sega Dreamcast Port

PortActive

An existing game or its source code brought to another platform.

Based on Sonic CD

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Image of the original game, Sonic CD. This project has no screenshots of its own yet.

Sonic CD (original game, not this project) — Image of the original game, Sonic CD. This project has no screenshots of its own yet.

Links, repository & details

About

A port of Sonic CD (RSDKv3) to the SEGA Dreamcast, based on the RSDKv3 Decompilation and using the mobile version as its base. The README says the full game works, including Special Stages, the JP and US soundtracks, the opening and ending FMVs, Time Attack, saves and the D.A. Garden. It was made almost entirely with Claude AI, according to the author.

How it differs from the original

The Leaderboards and Achievements menus do not work, and Time Attack times cannot be uploaded. A dev menu is enabled by default and opened with the Y button, and it can be turned off in settings.ini.

Getting started

No assets are provided. Bring your own Sonic CD Data.rsdk from the mobile version (PC 2011 and Origins are untested) and your own FMV files encoded as mp4. Build locally with KallistiOS and mkdcdisc on Linux, macOS or Windows via WSL, or use the linked autobuilder, to produce the CDI.

Known issues & limitations

Times cannot be uploaded from Time Attack.

What you need to run it

Original game files required. The project ships code only; you provide your own copy of the game (Dreamcast version).

You need your own mobile-version Sonic CD Data.rsdk file; the PC 2011 and Origins versions are untested and presumed unsupported.
You need separate FMV files for the US and JP soundtracks, encoded as MP4.

Features

The full game, including Special Stages, works.
Opening and ending FMVs work.
Time Attack works, but times cannot be uploaded.
D.A. Garden, level select, and sound test are available after unlocking them through play.
The game supports saves, including a custom icon in the Dreamcast BIOS save menu.

Controls

Press Y to open the dev menu, which is enabled by default.
In the dev menu's stage selection, press Start for regular play or A for debug mode.

Summarised from the project's README.

Modding & tools

It is compatible with GCC 14.3 and KOS 2.2.x; other versions are at your own risk.

FAQ

What is Sonic CD Sega Dreamcast Port?: Sonic CD Sega Dreamcast Port is an open-source port of Sonic CD. An existing game or its source code brought to another platform. The original game ran on Dreamcast.
Do I need the original game files to run Sonic CD Sega Dreamcast Port?: Yes. The project does not include the original game's assets, so you need your own copy.