Truly an excellent example of what a game should be. Starting with their recent move to make games available at a reduced in-game cost, having clever and challenging aspects to every game, and ending with the model use of ads, this game is first rate. I've played a great number of games that have ads, some so bad that the game becomes unplayable. Are there ads? Why yes, but you choose if you want to see them. Thank you for offering a great game.