Childhood classic that I've always come back to again and again. $2 for premium is perfectly reasonable given the amount of stuff you get with it (though the payment might take a while to come through; resolved this by hitting restore purchase for some reason). All the modes are amazing (though endless is lacking), only major complaint is how in Checkpoint 2 glass that slides your way ends up hitting you even if you're already too close to break it. Otherwise great game!!!