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forked from akarnokd/open-ig

Free & open-source reimplementation of Imperium Galactica


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Current game version: BETA (0.95.210)

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Installer (version 0.45)


Open Imperium Galactica (Open-IG) is an open source [Java]( Java)TM reimplementation of the [Digital Reality]( Digital Reality) game [Imperium Galactica]( Imperium Galactica), a popular, 4X (eXplore, eXpand, eXploit, and eXterminate) real-time space strategy game developed around 1996 in Hungary.

The project contains all necessary files (with the permission from the copyright owner Digital Reality) to run the game standalone, there is no need for the original Imperium Galactica files.

System requirements

Minimum Recommended
Java 1.7u71 x86 or newer Java 1.7u71 x64 or newer
Any operating system with graphical user interface 64 bit operating system with graphical user interface
A mouse with scroll wheel A mouse with scroll wheel
832 MB RAM 3 GB available RAM
1.4 GB disk space 2 GB disk space
1.5 GHz Dual Core CPU 2 GHz Quad Core CPU

Supported languages:

  • English
  • Hungarian
  • German
  • Russian
  • French
  • Spanish (graphics and text only)




Thanks to Bajor "Danyetz" Dániel for the spying related work for IG2 DLC, weather effects and some other new developments.

Big thanks to Grigoriev Kirill for the Russian translation.

Thanks goes to Silvern Tiger for testing and translation.

Big thanks goes to Norbert "Silver83" Pellny, who took the enormous job and cleaned the game background images, helped with the german version and tested the game tirelessly.

I'd like to thank Torma "Joe" József for his intensive testing and help with the sound, graphics, AI, concepts and many more things.

I'd like to thank TCH from DOSGames forum for helping me discover the animation file format. He gave the idea to check for two compression steps instead of only one.

I'd like to thank my colleague Galaxy for creating the new Open-IG splash screen and helping me with the data model behind Open-IG.

I'd like to thank Harrach Gergely for the Credits data, ship firepowers, subtitles and other stuff.

I'd like to thank Góz Tamás from for identifying some of the voice actors.



Free & open-source reimplementation of Imperium Galactica









  • Java 100.0%