Used this app for a while. Was a great game. All of a sudden one of the ads was just this black screen with no actual ad or x button or anything, had to reset the app to continue playing. The 4th time this happened, I lost the ability to access my phone entirely for 30mins. I have other game apps on my phone and none of them did this. I understand needing ads, but there should be better vetting. Unistalled as soon as I could gain control of my home page again.