One star because you can't change the settings properly. You can change the frame rate. You can change the language. You can change notifications. You can Not change the sound. You can Not change the music. You can not change the mature language filter. I can't concentrate with bg music which is why I have to turn the volume on my phone down, and I also can't concentrate with no sound, although I can concentrate a little bit more with no sound. So my review stays at 1 star until it's fixed.