# OpenSE4: reimplementing the Space Empires IV Deluxe engine

> OpenSE4 reimplements the Space Empires IV Deluxe engine in C++23, loading art, sound and data from the player's own installation. Its rule specifications combine the original manual, data files, observed behavior and executable analysis; the engine covers economy, movement, combat, research, diplomacy and computer players, with remaining parity differences documented.

- Type: Case study
- Targets: Game
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-08
- Original resource: <https://github.com/lowlevelmetal/OpenSE4>
- Primary source: <https://github.com/lowlevelmetal/OpenSE4/blob/ade8a5d43aebf59f2955054c918272dda4b3737e/README.md>
- Catalog page: <https://awesomerea.org/resources/opense4-case/>
- Record JSON: <https://awesomerea.org/resources/opense4-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/opense4-case/index.md)

## Requirements & limits

- **Prerequisites:** An owned installation of Space Empires IV Deluxe is required to supply game data.
- **Prerequisites:** The source lists Windows and Linux builds and macOS source builds, with Vulkan 1.3 or OpenGL 3.3 graphics paths.
- **Limits:** The author documents small unresolved rule details and remaining computer-player expansion differences.
- **License:** GPL-3.0 license.

## Primary sources

1. <https://github.com/lowlevelmetal/OpenSE4/blob/ade8a5d43aebf59f2955054c918272dda4b3737e/README.md>
2. <https://github.com/lowlevelmetal/OpenSE4/blob/ade8a5d43aebf59f2955054c918272dda4b3737e/docs/spec/05-research-intel-diplomacy-ai-multiplayer.md>

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## 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.