This is a rare gem of a game, that deserves All the positive reviews/awards!! Completely innovative in all ways, graphics/controls/ect. You can play offline. I guess the only "negative" thing is the game has 80 levels & only the 1st 40 are free. But these aren't short levels you fly though, the game gets progressively more challenging. I most likely will end up buying the 2nd half of the levels upon completing these, though I'm not even close to finishing them yet. ha. Perfect & addictive game!!