The Prize Wheel is unfair — it almost always gives me missiles when I already have a ton of it. Although there are 3 gold slots out of 10, the chances that the wheel will stop on any of the gold slots is very slim, thereby making the game progress very slow. Gold is used to buy the very expensive planes & their ammos/missiles and also your support fighters. To earn enough gold, you are forced to watch a ton of ads, which eventually made me lose interest in this game. So, I'm uninstalling it now.