This game is definately worth buying from the app store as game play is amazing and the storyline retains your intrest throughout. The game itself however requires a controler for a worthwhile experience and in order to retain saved games and avoid game launching problems, you must sign in to game center BEFORE starting the game. I thouroughly enjoyed the game and played almost all of the way through it before the game deleted my saves as a result of not being logged in to game center so I am writing a review to help others avoid this problem. Although I lost all of my saves, had that not happened, this game would be my all-time favorite game on any platform. I am excited for the release of the next batman game and with a deep breath I am going to resart the game on a harder level and give it a five star rating anyway.