There were also these combination choose your own adventure/RPG books. It was an RPG where you rolled dice and fought monsters but the book acted as the DM so you could play by yourself.
Living out in a rural area having no one else to play D&D with those books were really cool. You had a limited # of plays on the book but more than one, and back then as a kid you didn't have the expectation of instant gratification & constant new stuff & content so it was fine.