I had this installed for a long time. I remember when I first played it, I loved the interface. Feels great to play I didn't touch it for a while, but got a notification to do a daily challenge and decided to do one. I had to watch a 30+ sec ad to start the puzzle...and GET THIS...right when I started getting it figured out and placing numbers in a flow a few min later...it interrupted me to force me to watch the same ad again! Uninstalled immediately after. Not dealing with that frustration.