It may be because I wear glasses, I don't know. I never could use the 3d feature at all until I got the "New" 3DS XL. The head tracking tech really helped me to be able to use it. But I have been greatly disappointed in the fact that very few games actually effectively use the 3D tech. Street Fighter 2 3d is about the best I have seen on the system so far with the exception of the Mario games. Most of the 3rd party games that I have tried, look flat. There may be those moments, but a majority of the game itself just looks like you are looking into a window that has some depth.