Escape From Natas

Escape From Natas is a Doom II replacement mod of two levels, created by Chris Christenson in 1997. It was preceded by Escape From Phobos and Escape From Deimos.

Demo files
The release includes two separate demo files by the author, EFN16.LMP and EFN19.LMP. They respectively require Doom v1.666 and v1.9 to be viewed and run for 36:52.37 (77433 tics), showing off level MAP01: Homeworld on Ultra-Violence.