The ads make it so frustrating to play, and the button to turn them off doesn't work. It's fun enough that I would be willing to pay a small fee to turn the ads off, but as is, I'm already getting sick of it after having it installed for only an hour or so. Edit 1: After restarting my phone, the button works. It's a bit more expensive than I would like, but hopefully a much better experience without the ads. Edit 2: There are only a handful of levels and then they repeat. Not worth it.