Waay waay waayyy too many ads. Basically after every level, and they are the really long, unskippable ones. Some ads even force you to get redirected to Google Play store before you can close them. I promptly deleted the app after that. I understand free games need to make their money with advertisements, but the amount is much too excessive compared to other similarly free games. The game itself is actually very fun, but the ad problem totally kills it.