# OpenNitemare3D: reimplementing Nitemare 3D in C#

> OpenNitemare3D is a C# reimplementation of the 1994 first-person game Nitemare 3D. It loads original bitmaps and maps, plays MIDI, and plays sound effects from the Windows version. The README says the active development branch is C-Rewrite.

- Type: Case study
- Targets: Game
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-07
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/BBQGiraffe/OpenNitemare3D>
- Primary source: <https://github.com/BBQGiraffe/OpenNitemare3D/blob/178dcf4b1075462b01de9321870a3c2665b855f3/README.MD>
- Catalog page: <https://awesomerea.org/resources/opennitemare3d/>
- Record JSON: <https://awesomerea.org/resources/opennitemare3d/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/opennitemare3d/index.md)

## Requirements & limits

- The documented C# build uses the .NET SDK and SFML. Place the Windows SND.DAT, plus UIF.DAT, MAP.1, IMG.1, and GAME.PAL, in bin/Debug/net5.0/data.
- Most menu options crash. New game and the sound editor are the options that do something.
- The README names no license.

## Primary sources

1. <https://github.com/BBQGiraffe/OpenNitemare3D/blob/178dcf4b1075462b01de9321870a3c2665b855f3/README.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.