Riesa.zip contains my first four levels, exhaustively detailed and
 realistic. They are in the style of the first nine DOOM I levels,
 sort of a moon base somewhere. Please e-mail me with comments or
 suggestions at clever@math.purdue.edu. By the way these were all created
 using DCK 2.2 exclusively. There are no new textures or sounds, but
 I really spent a huge amount of time on making textures, lighting and
 situations realistic (as real as DOOM can get anyways.) They are all made
 with single players in mind, but you may feel free to change them to 
 deathmatch or whatever you want.