# Vault Engine: rebuilding Fallout and Fallout 2 in Rust

> Vault Engine reimplements Fallout and Fallout 2 as a Rust engine that reads the user's retail DAT archives. Its modules cover DAT formats, the INT script VM, combat, AI, saves and rendering, with behavior built from written clean-room specifications and checked through state hashes and trace oracles.

- 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/mikyowski-ui/vault-engine>
- Primary source: <https://github.com/mikyowski-ui/vault-engine/blob/3adeac9c0a14bbfbb56a5439155743d401e1bb69/README.md>
- Catalog page: <https://awesomerea.org/resources/vault-engine-case/>
- Record JSON: <https://awesomerea.org/resources/vault-engine-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/vault-engine-case/index.md)

## Requirements & limits

- **Prerequisites:** The user's own Fallout or Fallout 2 DAT archives are required.
- **Prerequisites:** Linux, Windows or macOS is supported; building from source requires Rust 1.88 or later.
- **License:** Apache-2.0 license.

## Primary sources

1. <https://github.com/mikyowski-ui/vault-engine/blob/3adeac9c0a14bbfbb56a5439155743d401e1bb69/README.md>

## More in Games

- [Vault13: a Rust reimplementation of the Fallout 2 engine](https://awesomerea.org/resources/vault13-fallout-2-case/index.md) · Case study
- [VCMI: recreating the Heroes of Might & Magic III engine](https://awesomerea.org/resources/vcmi-case/index.md) · Case study
- [VERA20K: rebuilding Red Alert 2: Yuri's Revenge in Rust](https://awesomerea.org/resources/vera20k-case/index.md) · Case study
- [Wacki: porting Wacki: Kosmiczna rozgrywka from decompiled code](https://awesomerea.org/resources/wacki-case/index.md) · Case study
- [wage-engine: a World Builder adventure engine reimplementation](https://awesomerea.org/resources/wage-world-builder-engine-case/index.md) · Case study
- [Wanderer: reimplementing Project Nomads](https://awesomerea.org/resources/wanderer-project-nomads-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.