Adventure Creator

Adventure Creator is a fairly simple adventure game creator/editor. You can
create rooms and hallways, with treasure chests, monsters, and traps that must
be avoided. Games can be saved to disk, but you need the Adventure Creator
cartridge to play them. Adventures can also be automatically randomly
generated.

The games you create are fairly limited, with only one monster allowed per
screen, and three types of weapons to hobble the monster with. The goal of the
adventures is to find some named object. However the object you seek is really
only a name, and is not represented graphically.

Adventure Creator