Personally, the banner ads at the bottom of the screen and ads for hints don't bother me at all. Most apps I find seem to have a system where you have to watch an ad after completing a puzzle or when you make a few incorrect guesses, which bother me. I do always appreciate when apps have an option to turn of ads for a buck or two so I'm sure others would appreciate that too. I'll be sure to check back in once I get a chance to play through a full game!