Case study

OpenEmperor: reimplementing Emperor: Rise of the Middle Kingdom

OpenEmperor 0.1.0-alpha.2 is a clean-room reimplementation of Emperor: Rise of the Middle Kingdom for Apple silicon macOS. It includes a playable city sandbox and an optional original-economy experiment. Original campaigns and save games are unsupported. The first launch asks for an installed or extracted Emperor data directory. The program is build/openemperor. Space pauses, and F5 and F9 save and load.

Targets: Game
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-07
Evidence class: C2 code & docs, no demo or download

Stars: 27
Last commit: 2026-11-09
Language: C++

GitHub data as of 2026-11-10

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Evidence

Observed: Code, documentation and a download method observed; no demo found.
Checked: 2026-11-09

How evidence classes are assigned

Requirements & limits

Xcode Command Line Tools, CMake, and OpenSSL 3. cmake -S . -B build -DCMAKE_BUILD_TYPE=Release -DCMAKE_OSX_ARCHITECTURES=arm64, then cmake --build build --parallel.
The README names no license.

Cite

BibTeX

@misc{openemperor,
  title = {{OpenEmperor: reimplementing Emperor: Rise of the Middle Kingdom}},
  howpublished = {\url{https://github.com/oliverjessner/OpenEmperor}},
  url = {https://github.com/oliverjessner/OpenEmperor},
  urldate = {2026-11-07},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/openemperor/}}
}

Plain text

OpenEmperor: reimplementing Emperor: Rise of the Middle Kingdom. https://github.com/oliverjessner/OpenEmperor (accessed 2026-11-07). Awesome REA entry: https://awesomerea.org/resources/openemperor/

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Primary sources

README.md GitHub · oliverjessner/OpenEmperor · Revision cc53e70