# Touhou Reiiden (The Highly Responsive to Prayers): Felipe-Gomes-Amorim/touhou-reiiden-port

> Source: <https://reversedwithai.com/p/touhou-reiiden-the-highly-responsive-to-prayers-fac05df1>
> Published: 2026-10-25 10:31:35+00:00

## Evidence at a glance

Based on the linked sources. The author's reported result and independent confirmation are separate checks.

- AI involvement
- Reported models: Claude. Tools: Claude Code, .NET 8 SDK, SDL2, OpenAL. The writeup below describes the work attributed to AI.
- Reported result
- Partial. This is the directory's source-based outcome classification.
- Independent confirmation
- Not reported.
- Human work and limitations
- The project explicitly states it is an unofficial fan work and requires the user's own game files. The repository includes x87 rounding tests and timing constant tests to maintain parity with the original hardware behavior.

### Original sources

## What was done

A fan-made C# port of the PC-98 game Touhou Reiiden, utilizing the ReC98 decompilation as a behavioral reference. The project is currently playable up to stage 15, with development assisted by Claude Sonnet 5.5.

The [touhou-reiiden-port](https://raw.githubusercontent.com/felipe-gomes-amorim/touhou-reiiden-port/HEAD/README.md) is an unofficial, engine-free C# (.NET 8) re-implementation of the 1997 PC-98 title *Touhou Reiiden*. The project relies on the community-led ReC98 decompilation as a behavioral and file-format reference, though it contains no original game code. Development is supported by AI coding tools, specifically Claude Code and Claude Sonnet 5.5, under the direction and review of the maintainer. The port is currently functional up to stage 15, including various boss encounters, menu systems, and audio synthesis. However, the game remains incomplete as the stage 20 bosses are not yet implemented. Audio components, including real-time MDRV playback, are noted as not yet verified against a real sound device. The project requires a legal copy of the original PC-98 game disk image (.hdi) to function, as it does not include game assets.

## Reproduce it

```
Download the latest release, ensure SDL2.dll and openal.dll are present, and run ReiidenPort.exe. The application will prompt for an .hdi disk image of the original game to extract necessary assets.
```