Modification for ZDoom-based ports.
Description: Earth, 2451 A.D. Humans exhausted all resources from the Earth, then people began to extract energy from the nucleus, the nucleus becomes unstable, people found on Mars rare material that made them portal that can be sent to any potentially habitable exoplanets, but on the ground there was a man who created a biorobot Sfax, who was sent to earth yet long ago, in 1995, he was immortal, he could not get old, but he could die. The scientists decided to use it as a test, and he stepped into the portal.