While I was in Mexico, I would play Super Mario 64 DS a lot. I enjoy using the thumb pad because it imitates the N64's control stick somewhat, but I noticed that it left some really bad scratches on the left side of the touch screen. My DS has a few minor scratches that I can overlook, but these were a bit more noticeable. That is the only game I use the thumb pad on, but it's not worth damaging the screen anymore. I put away that damn thumb pad and I refuse to use it!