after you play for a long time it became too hard
I am a long time user of your app. But as I write to you before, the huge problem is that the app doesn't adapt to my skill. After you play a few months, it became to hard, not fun to play, and progress is stopped. It is a shame because the app is besides that great. Other similar apps as yours are solved that in a manner that app difficulty track your skill and you get games that match your ability. Hope you fix that. 😀