Hello, my boys get for Christmas each a 3DS XL. I have attached from experience even before kick-off the foil. The films are very fit, you have only about 0.5mm game. Applying film as described, paying attention, make sure that the film parallel to the top or bottom edge runs. Substituting the film minimally wrong, then she runs at the rear of the display edge and can not rest there, it forms an air gap, which can not be removed. Therefore the protective foil not quite, if you is not sure that all corners fit, so you can release the film again and start again. As I said, I have just 4 sheets attached. None of them worked on the first try, so need for a lot of patience. At the end you will be rewarded with a bubble-free screen and crystal clear Durchblick !! The touch screen works with the film properly! PS .: The removal of disturbing dust grains works really well with scotch tape !!