The fundamental file to play GUN-TACTYX is hosted at the APOCALYX 3D Engine site. A large number of mirror sites are available thanks to the hosting service of SourceForge.net.
GUN-TACTYX: Executable and Documentation (v 1.1.5 size 1.74 Mb)
To play the game you need a PC with Windows 98 or higher and OpenGL drivers installed. Hardware 3D acceleration is required and the resolution of the graphic card must use at least 16 bits color mode to execute the application full screen or in a window.
The full C++ sources are available, but absolutely they are not necessary to play.
GUN-TACTYX: Sources (v 1.1.5 size 1.13 Mb)
To recompile the sources the Code::Blocks IDE is needed (http://www.codeblocks.org/) with the Free Borland C++ Command Line Compiler 5.5.1 installed (http://www.borland.com/bcppbuilder/freecompiler/)