A conversion of an Amiga Doom clone
It was also called "Cytadela".
The original was created in mid 1990's by Virtual Design, and released firstly in Poland and then in other countries.
Citadel is written in C++ and uses the most common libraries - OpenGL and GLU for 3D, and SDL and SDL_mixer for 2D, music, sounds and controllers - so it's easy to port it on many platforms.
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What's New in This Release:
- intro and outro movies
- fixes a minor graphical bug