This is the adventure gamebook "The Prince's Duel." I found it while organizing. It's a rare type of gamebook designed to be played by two people. It also includes an adventure sheet. I believe I played through it as the warrior. As you can see in the images, the box has noticeable stains and some discoloration due to the passage of time. Please check the images. I may have overlooked something, so if you have any concerns, please feel free to comment, and I will check and respond. Thank you for your consideration.