Large complex building occupied by unfriendly monsters...
id software for creating DOOM.
New level from scratch.
DETH 5.24, BSP, WinTex 3.41
Saving the game might cause Doom to crash. (Save game buffer overrun) This is a very large level with a huge amount of things and details.
If this wad is viewed with any wad-editor you'll be alerted about missing textures and unclosed sectors. However in this wad *all* such cases are fully intended to create certain special effects (invisible stairs). You don't need to fix them!