Black Crystal

The game was primarily a text-adventure with a graphical map.

Completing a map allows the player to advance, while failure means a restart of the current map.

The player takes the role of an adventurer who must traverse the fantasy Kingdom of Beroth to defeat Tobias.

Tobias has summoned a Black Crystal and this can only be destroyed by visiting six maps and retrieving seven rings of power. Once collected, the player must defeat Tobias in a final showdown.

Due in-part to its innovative multi-load approach, the game has been frequently cited as one of the best ZX81 adventure games.

"There are only two graphics adventures which stand out in the market at the moment. The first to be produced was Black Crystal from Carnell Software..."