What are Fighting Fantasy game books?
I had to do some research first, as I had never seen these before. These book were originally published from the early 80's up until 1999. It appears that new editions were released and some of the them are being turned in apps now.
It's essentially like those Choose Your Own Adventure books (which I read as soon as the library got new ones when I was kid. I now have a small collection of them on my shelf) but you have a score sheet and dice. I photocopied the score sheet (which they recommend) rather than writing in the book itself.