# Open SoM Runtime: rebuilding the Sword of Moonlight runtime

> Open SoM Runtime recreates Sword of Moonlight's game runtime in Unity, including content loading, event parsing, menus and explorable maps. The author reports partial event support and describes compatibility limits for Dark Destiny, SoM Ex games and some video codecs.

- 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/Sword-of-Moonlight/OpenSoMRuntime>
- Primary source: <https://github.com/Sword-of-Moonlight/OpenSoMRuntime/blob/527abdcd4dd45e9d462a7a583f9db463abb0f66c/README.md>
- Catalog page: <https://awesomerea.org/resources/open-som-runtime-case/>
- Record JSON: <https://awesomerea.org/resources/open-som-runtime-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/open-som-runtime-case/index.md)

## Requirements & limits

- **Prerequisites:** Unity project with compiled Reign game data included for development; other games require their content in the documented StreamingAssets folder structure.
- **Limits:** Event parsing is partial, and collision currently has no player response.
- **Limits:** Dark Destiny and SoM Ex games do not load correctly; some video sequences depend on codec support.
- **License:** MIT license for the repository code.

## Primary sources

1. <https://github.com/Sword-of-Moonlight/OpenSoMRuntime/blob/527abdcd4dd45e9d462a7a583f9db463abb0f66c/README.md>

## More in Games

- [Open Sosaria: reconstructing the 1981 Apple II Ultima engine](https://awesomerea.org/resources/open-sosaria-ultima-case/index.md) · Case study
- [Open Van Buren: reconstructing the Fallout 3 tech demo engine](https://awesomerea.org/resources/open-vanburen-case/index.md) · Case study
- [Open Wages: a Wages of War engine reimplementation](https://awesomerea.org/resources/open-wages-case/index.md) · Case study
- [Open76: an Interstate '76 engine reimplementation](https://awesomerea.org/resources/open76-case/index.md) · Case study
- [Open76: reimplementing Interstate '76 in Unity](https://awesomerea.org/resources/open76/index.md) · Case study
- [openage: a Genie Engine reconstruction for Age of Empires games](https://awesomerea.org/resources/openage-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.