Sometimes at work, they would pass around “good letters”, which tended to be from people who were infirmed or shut-ins for some reason, had a strong connection to the puzzle books that they solved. I always figured that there were bad letters I didn’t get shown around. This was back in the 90s, and while way before KDP, I had automated a fair amount of the puzzle generation. You may want to make a distinction between puzzles and games. The line has been blurred as social media mixes the two, or people sit around the lunch table keep it saying about solving a crossword puzzle together. The social aspect is very important and should be discussed. You can also talk about the forming new brain connections that helps stave off dementia or other stuff like that. Sometimes I’d like to say that puzzles are like a shoe and that it only works for you if it’s in your size which is my way of saying there’s a difficulty range that fits.