# IGI-RE: functional decompilation of Project I.G.I.

> IGI-RE rewrites the EU Project I.G.I. executable in C, function by function, and compares each rewrite with the original through Unicorn-based differential tests and scripted gameplay. It builds a standalone game executable and a DLL for substituting rewrites into the original; the author reports all 5,376 identified game and engine functions rewritten.

- Type: Case study
- Targets: Game
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/neonixmoddingteam/IGI-RE>
- Primary source: <https://github.com/neonixmoddingteam/IGI-RE/blob/088950a517a18bfbb15c7dc6b28b09564f85c7d4/README.md>
- Catalog page: <https://awesomerea.org/resources/igi-re-case/>
- Record JSON: <https://awesomerea.org/resources/igi-re-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/igi-re-case/index.md)

## Requirements & limits

- **Prerequisites:** An installed EU release of Project I.G.I. with the specified IGI.exe and required game files.
- **Prerequisites:** Windows or Linux with Wine; builds require CMake, Ninja and i686 MinGW-w64.
- **Limits:** Other releases are unsupported; the linked Microsoft C runtime is represented by system msvcrt.dll.
- **License:** GPL-2.0-or-later for the project's source and tools.

## Primary sources

1. <https://github.com/neonixmoddingteam/IGI-RE/blob/088950a517a18bfbb15c7dc6b28b09564f85c7d4/README.md>

## More in Games

- [Ikachan3: decompiling the Nintendo 3DS release](https://awesomerea.org/resources/ikachan3-case/index.md) · Case study
- [Indy 500: a first-pass labeled Atari 2600 disassembly](https://awesomerea.org/resources/indy-500-atari-2600-disassembly-case/index.md) · Case study
- [Jet Force Gemini: a Nintendo 64 decompilation](https://awesomerea.org/resources/jet-force-gemini-decomp-case/index.md) · Case study
- [Jet Set Willy: a SkoolKit disassembly of the ZX Spectrum game](https://awesomerea.org/resources/jet-set-willy-disassembly-case/index.md) · Case study
- [Kaboom!: an annotated Atari 2600 disassembly](https://awesomerea.org/resources/kaboom-atari-2600-disassembly-case/index.md) · Case study
- [Karateka: a buildable MS-DOS decompilation](https://awesomerea.org/resources/karateka-msdos-decompiled-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.