# OpenCivOne: rewriting the original Civilization

> OpenCivOne rewrites the 1991 DOS Civilization game for desktop systems with .NET 8 and Avalonia. A virtual CPU runs assembly code still awaiting replacement, while rewritten portions use C#. The game currently needs the owner's original text, picture, and palette files.

- Type: Case study
- Targets: Game
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-09
- Added to the catalog: 2026-11-09
- Original resource: <https://codeberg.org/rhorvat/OpenCivOne>
- Primary source: <https://codeberg.org/rhorvat/OpenCivOne/src/commit/f3c20ccb9dd3f13b04befa0086e24c1c6906d1f8/README.md>
- Catalog page: <https://awesomerea.org/resources/opencivone-case/>
- Record JSON: <https://awesomerea.org/resources/opencivone-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/opencivone-case/index.md)

## Requirements & limits

- **Prerequisites:** .NET 8 and Avalonia are used on Windows, Linux, and macOS desktops.
- **Prerequisites:** A legally owned copy of the original game is required, including its .txt, .pic, and .pal files.
- **Limits:** The rewrite is in progress; some assembly code still runs through a virtual CPU.
- **License:** No licence stated on the project page.

## Primary sources

1. <https://codeberg.org/rhorvat/OpenCivOne/src/commit/f3c20ccb9dd3f13b04befa0086e24c1c6906d1f8/README.md>

## More in Games

- [OpenCMR2 VR: a Quest and PCVR port of Colin McRae Rally 2.0](https://awesomerea.org/resources/opencmr2-vr-case/index.md) · Case study
- [OpenCrossing Anbernic: porting Animal Crossing to Anbernic handhelds](https://awesomerea.org/resources/opencrossing-anbernic-case/index.md) · Case study
- [OpenCrossing-Xbox: an original Xbox port of Animal Crossing](https://awesomerea.org/resources/opencrossing-xbox-case/index.md) · Case study
- [OpenCrown PC: a native Dragon's Crown Pro host for console dumps](https://awesomerea.org/resources/opencrown-pc-case/index.md) · Case study
- [OpenDW: porting Dragon Wars to a C game engine](https://awesomerea.org/resources/opendw-dragon-wars-case/index.md) · Case study
- [OpenDW: porting the original Mac Deepworld client to Windows](https://awesomerea.org/resources/opendw-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.