This belonged to my family. My grandfather liked Sudoku and was given this as a gift, but he transferred all the puzzles to another paper and solved them, so he no longer needed it, and I am selling it. It seems he used it with care, as there are no creases from being opened. This is a set of 8 Nikoli Difficult Sudoku books. I purchased these used, with the understanding that there were no markings. I have flipped through them to check for any markings, but there might be some. Please check the condition in the photos. I have not made any markings in these books since I purchased them.