UPDATE: Keep freezing and then even closing re-opening doesnt work. You have to reinstall and yku lose all your high scores and averages. SOOO frustrated as I love this game.
I would give this five stars if the iPhone version didnt stink. While the iPhone version has some awesome maps that are made for the smaller screen, the iPhone features of notification bar and other things interfere as your play, for example you try to shoot with a Canon and notification center opens then the game freezes and even after closing can no longer be played its permanently frozen. I would have to reinstall, but then I was on my high score is. So now I can only play on the iPad. I also wish the iPhone maps were available in the iPad version, as they are cool.