Single level with lots of new graphics. This is a sequel to the Pleiades level where you captured the starship pleiades. (you may wish to download Pleiades, which can be found at the same sites as this level under the names Pleiade2.zip and Pleiade3.zip; Pleiade2.zip is for Doom2 versions before 1.9 while Pleiade3.zip is for Doom2 versions 1.9 and later.) Mir will run under all versions of Doom2. Note: Pleiades and Mir are not compatible for combination into a single multilevel PWAD nor for play under the same loading of Doom2. They have different sky and wall textures assigned to the same names. Play action features random monster placement which gives the action a different twist each time it is played. Finally, this level is a standard patch wad that does not alter the main Doom wad and is playable with the standard -file parameter.
Doug Ryerson, I borrowed a few of his textures from his ANTARES.WAD. Dave Swift, I borrowed his idea of shiny gold surfaces for a door textures from his H2HMUD01.WAD level. Michael Coyne/ Steve McCrea, et al (Trinity), source of Toccata, the organ music selection. ID Software, I redefined their COMPSTA1 and COMPTALL textures as animated textures to produce "living" instrument panels.