Too many ads make the game almost unplayable. They pop up after every level, which are very short. I rarely buy no ads, but I was going to for this- then I saw permanent no ads is $10. That's ridiculous. Additionally, if you sign up with email instead of facebook, it puts your email (minus the domain) as your username, which is public, and you can't change it. You can't even activate/deactivate an account- even if the email is not yours, you can use it and the owner can't do anything about it.