iPhone 6s user here. The app tends to not open properly when I need it most. When it does open, I love it and it helps to speed up my turn. It is totally legal for use in all versions of Munchkin (read the rules people) and the longer you wait to use your boon the better it is! It not only counts your levels but it also counts the strength you are fighting at and the strength of the monster you are fighting (just one monster though). There is also a dice rolling feature (by the way, when playing Munchkin always have a 20 sided die in your pocket...Youll thank me later). Pretty basic and user friendly with some funny Artwork as well. You will learn to love the sound of the chime that accompanies leveling up. A word to the developers, please get rid of whatever bug is causing your app to be unreliable. Thanx.