This is an excellent adventure in which you have to amass as much treasure as possible and rescue the four Heroes of Karn, who, once found, will aid you in your quest.
The program has a large vocabulary and accepts complex commands. 'Attack giant clam with shovel' is acceptable and so are instructions delivered to other characters: 'Say to Beren "attack barrowight with tinderbox" will send Beren into action, though not necessarily with the desired effects.
You may also command animals to attack other animals - within reason. Setting a frog on a bear is hardly going to impress the bear and wouldn't do much for the frog, and the program treats such suggestions with appropriate disdain.
Every location has a graphic display and some are accompanied by the best music I've yet heard on the C64.
The only drawback with this game is the amount of time you have to spend trying to find out which words are acceptable. If the program doesn't understand something, it apologises politely, but doesn't tell you which word it doesn't understand.
Apart from the annoyances mentioned above, Heroes Of Karn represents excellent value for money and is highly recommended.