"Sudoku" toilet paper!

This "Sudoku" toilet paper will shift your attention from annoying abdominal pain to solving the problems in a 3×3 grid. Without further ado, the price of this toilet paper will be entirely different from that of ordinary toilet paper, it is as high as $4.95. I believe that most people who buy this "Sudoku" toilet paper will encounter new trouble: it's impossible to finish a "Sudoku" game within the limited time in the toilet, therefore they will not have the heart to use up this unfinished toilet paper.