They featured some themes and names inspired by the books of J. R. R. Tolkien and so became known as the Middle-Earth Trilogy.

For legal reasons the references to Middle Earth were removed and the trilogy was retitled Jewels of Darkness.

An expanded version of the original Adventure by Will Crowther and Don Woods Similar in structure to the previous game, the player must defeat the Dark Lord, Agaliarept.

A continuation of the previous game; following the defeat of the Dark Lord, Agaliarept, the player must explore his dungeon looking for treasure.

It described the puzzles as illogical, the Commodore version's graphics as "crude", and, like the parser, below the standard of previous Firebird text adventures.