I've had this installed for only a few days and it just gets more and more ridiculous. It's pay to play. You RARELY get power ups, so you're stuck either paying real money for more or playing at a disadvantage... *Edit* They should make it clear that you need to add friends. Now that I've done so, the game is much more enjoyable because you can help each other with credits and power ups. I added a couple stars, I'd give it 5, but it'd be great if the power ups & credits were more obtainable.