When I finished the first daily puzzle, I rated this game five (5) stars. Clean, simple, user friendly. During my 2nd puzzle I recieved a 15 second unskippable ad. As soon as the ad was over I made the decision to delete the game from my phone. ---- Ads during menu screens, between games, or even the ones that show up as soon as you open the app are all fine. Ads that interrupt game play? No thank you. Two (2) stars. (especially ads for another suduko based game? just, why?)