I can't believe that this is the first I have heard of this. Advergames on vinyl records played on a spectrum.
"In the case of these programs on vinyl, the user would have to play back the proper portion of the record, record the resultant chatter to tape, and load the tape into the spectrum. Some users have mentioned playing certain games so much that they could recognize the loading sounds.A gigantic step up from encoded text files were actual games included in the grooves of records. In 1984, The Thompson Twins released 'The Thompson Twins Adventure Game' in both regular vinyl and flexi disc formats. The game is a bizarre text-based adventure in which you guide the Thompson Twins around a land of beaches and caves."
Similarly encoded games were also added to the tape releases.
Found on Adverlab.