Case study

butterfly: emulating DDR A online services

butterfly emulates the e-AMUSEMENT service used by DDR A so the game can connect to a local server. Its Java code handles profiles, scores, options and rivals, with support code for the service's packet encryption and compression.

Targets: Game · Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-09

Stars: 99
Last commit: 2020-09-07
Language: Java
License (GitHub): Apache-2.0

GitHub data as of 2026-11-09

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Requirements & limits

Prerequisites: Java 11 or later on Windows, macOS or Linux.
Prerequisites: Set the game's services URL to http://localhost and turn off url_slash.
Limits: Change options in the server's SQLite database; the server has no web UI. Event progress is not tracked.
License: Licensed under Apache-2.0.

Cite

BibTeX

@misc{butterfly-ddr-a-service-case,
  title = {{butterfly: emulating DDR A online services}},
  howpublished = {\url{https://github.com/skogaby/butterfly}},
  url = {https://github.com/skogaby/butterfly},
  urldate = {2026-11-09},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/butterfly-ddr-a-service-case/}}
}

Plain text

butterfly: emulating DDR A online services. https://github.com/skogaby/butterfly (accessed 2026-11-09). Awesome REA entry: https://awesomerea.org/resources/butterfly-ddr-a-service-case/

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Primary sources

README.md GitHub · skogaby/butterfly · Revision 469b79a