I’m looking for a book with the title, if I remember correctly, “Duel for Volrathia.” It was a book to teach children how to program computers using the BASIC programming language. 
I think it had a red border on the cover, hardback, about 9×12″.
The book told a story of a boy and a robot that traveled to the planet Volrathia, who then use computer programming to solve different puzzles and progress through the story. It was all quite clever because of the lack of formality; the reader was on an adventure! The story (and programming exercises) climaxed in a showdown between the reader and the giant war computer of Volrathia, which plays Tic-Tac-Toe.
I can’t find any record of the book, neither with the library where I grew up, nor with the Library of Congress. Any help would be appreciated!