From the introduction:
Throughout the myriad planes of the multiverse are many cities where beings both mortal and immortal dwell. One such is Sigil, the City of Doors; a wondrous city of ancient mystery.
Another is Ribcage. A city of evil, oppressive Order. Of blood, and of darkness.
Ribcage teeters on the edge of a Lower Plane of evil, the fiends held at bay only by the efforts of Lord Paracs. If this sorcerer falls, Ribcage will plunge into the Nine Pits of Hell. Yet surely the celestials would not allow such a victory for evil?
This game is distributed as a ZIP archive containing 13 JPG images, 11 DOC files, and one ASCII "readme" file.