# Alien Trilogy: a byte-matched PS1 source reconstruction

> Alien Trilogy reconstructs C source for the USA PlayStation game executable SLUS_000.07 using its original GCC 2.5.7 toolchain. Per-function comparisons check rebuilt code and relocations against retail bytes; a gate overlays rebuilt units on the user's executable and checks the complete hash. The author reports 645 byte-matched game C functions, with remaining gaps and pending source-quality work documented.

- 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/lemiur/alien-trilogy-decomp>
- Primary source: <https://github.com/lemiur/alien-trilogy-decomp/blob/b0bf7205dea028f4c16d94344a872facc76a7e4a/README.md>
- Catalog page: <https://awesomerea.org/resources/alien-trilogy-ps1-decomp-case/>
- Record JSON: <https://awesomerea.org/resources/alien-trilogy-ps1-decomp-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/alien-trilogy-ps1-decomp-case/index.md)

## Requirements & limits

- **Prerequisites:** A personal copy of the retail SLUS_000.07 executable is required.
- **Prerequisites:** The pinned PsyQ toolchain, Runtime Library 3.3 SDK, Python 3 and DOSBox-X are required.
- **Limits:** The author reports 452 remaining byte gaps and eight MATCH-PENDING functions.
- **License:** MIT license.

## Primary sources

1. <https://github.com/lemiur/alien-trilogy-decomp/blob/b0bf7205dea028f4c16d94344a872facc76a7e4a/README.md>
2. <https://github.com/lemiur/alien-trilogy-decomp/blob/b0bf7205dea028f4c16d94344a872facc76a7e4a/PROGRESS.md>

## More in Games

- [Alien vs Predator: reconstructing the Atari Jaguar cartridge](https://awesomerea.org/resources/alien-vs-predator-jaguar-case/index.md) · Case study
- [Animal Crossing: matching GameCube decompilation](https://awesomerea.org/resources/animal-crossing-gamecube-decomp-case/index.md) · Case study
- [Animal Crossing: Wild World: matching Korean DS decompilation with differential runtime checks](https://awesomerea.org/resources/animal-crossing-wild-world-decomp-case/index.md) · Case study
- [Animal Forest: an in-progress matching N64 decompilation](https://awesomerea.org/resources/animal-forest-n64-decomp-case/index.md) · Case study
- [Another Mind: matching PlayStation source reconstruction](https://awesomerea.org/resources/another-mind-decomp-case/index.md) · Case study
- [Ape Escape: matching PlayStation executable decompilation](https://awesomerea.org/resources/ape-escape-matching-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.