Thorn EMI was a U.K. based company that produced software for a variety of computing platforms in the early 1980s. They packaged their software in distinct hard plastic black boxes.
From the back of the box ... Volume 1 - The Tower of London and Tower Bridge. A New fun type of jigsaw puzzle - in fact, 16 different puzzles. you can make it easy or difficult by choosing how many pieces to cut the picture into and the computer will help, if you want, by refusing to insert incorrect pieces into the picture. Even so, you may not find it taht easy to begin with, and you will certainly have to concentrate to get the picture right."
The box suggests that there are 16 variations to the games and there is a picture chart that tells the buyer what accessories they will need.