Chimaera, written by Chris Newall, is one of the first procedurally generated adventure games. While the numbers of items, treasures, and dangers are fixed, the map is generated anew for each game based on a random seed, ensuring that there is always more to map.
Newall wrote the game originally in Fortran, circa January 1984. The Fortran version "languished in the archives" until 2002, when Newall rewrote it in C and re-released it as "Chimaera version 1.001".
This Z-machine version of Chimaera has been compiled from Newall's C source code, with a very small number of bugfixes contributed by Arthur O'Dwyer.