From the April 1985 issue of Electronic Games Magazine (via the Internet Archive):
“Start an Electronic Novel by reading the opening chapters in the hard-cover book, and then go directly into the story. As the asynchronous real-time universe unfolds, your actions determine the direction and the outcome of this imaginative journey. You can’t get tired of these Electronic Novels because they’re always changing, just like life.”

And, with a 3D VR headset looking very much like the new Oculus Rift, this ad from the November 1983 issue: