I wrote a BASIC program in the fifth grade that was a direct lift from this choose your own adventure book. Boy from the modern world goes back in time and becomes part of King Arthur's court. The various story paths model the stories of Gareth, Gawaine, and Lancelot, as well as other stories I don't recognize. A few wrong choices and you can end up killing King Arthur after making a deal with Mordred and Morgaine LeFay. Heavy stuff for a youngster.