# Touhou 8: an independent matching decompilation of Imperishable Night

> Cirno-Labs/th08 reconstructs Touhou 8: Imperishable Night retail 1.00d in C++ and checks the build against the user's original game. The author reports byte matches for all game functions and the standalone executable, using the original MSVC toolchain, per-function comparisons and replay traces.

- Type: Case study
- Targets: Game
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-08
- Original resource: <https://github.com/Cirno-Labs/th08>
- Primary source: <https://github.com/Cirno-Labs/th08/blob/3ee853622a8fc56326e3d5dec6e6bf571449d8da/README.md>
- Catalog page: <https://awesomerea.org/resources/cirno-labs-th08-case/>
- Record JSON: <https://awesomerea.org/resources/cirno-labs-th08-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/cirno-labs-th08-case/index.md)

## Requirements & limits

- **Prerequisites:** A user-supplied retail Touhou 8 copy updated to version 1.00d.
- **Prerequisites:** The documented build uses the original Visual C++ .NET 2002 toolchain under Wine on Linux.
- **Testing evidence:** Byte identity and replay parity are author-reported results.
- **License:** GPL-3.0 license.

## Primary sources

1. <https://github.com/Cirno-Labs/th08/blob/3ee853622a8fc56326e3d5dec6e6bf571449d8da/README.md>
2. <https://github.com/Cirno-Labs/th08/blob/3ee853622a8fc56326e3d5dec6e6bf571449d8da/orig/README.md>
3. <https://github.com/Cirno-Labs/th08/blob/3ee853622a8fc56326e3d5dec6e6bf571449d8da/docs/exe-parity.md>

## More in Games

- [Touhou Eiyashou: matching-source reconstruction of version 1.00d](https://awesomerea.org/resources/gensokyoclub-th08-case/index.md) · Case study
- [Tourist Trophy: matching decompilation of the PS2 CORE.TT executable](https://awesomerea.org/resources/tourist-trophy-decomp-case/index.md) · Case study
- [Toy Story 2: a PC game decompilation with reccmp comparisons](https://awesomerea.org/resources/toy-story-2-pc-decomp-case/index.md) · Case study
- [Toy Story disassembly: rebuilding the Mega Drive ROM from generated source](https://awesomerea.org/resources/toy-story-mega-drive-disasm-case/index.md) · Case study
- [Turok 2: Seeds of Evil: a matching Nintendo 64 decompilation](https://awesomerea.org/resources/turok-2-seeds-of-evil-decomp-case/index.md) · Case study
- [Turok 3: an archived multi-version decompilation](https://awesomerea.org/resources/turok-3-decomp-case/index.md) · Case study

## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.