Don't trust your instincts. Don't trust your sense of reality. This fall, there are more than three dimensions.
Crista Forest, aka "CD Warrior" for the cfmanson textures, the Malice Team and Raven software for the Hexen textures, submerge for the N5VTX textures, Kim Malde for the sky, the estate of M.C. Escher for the title graphics, Saiyapimp and Tim Fewell for the music, and the fine folks at www.zdoom.org.