This game is a great twist on the lane defense genre, with the addition of cards and mathematics. And dont listen to that review complaining about the IAPs, he clearly has no idea what hes talking about. Ive had this game for months and the IAP is not required at all, and the club he refers to: its a one time fee of $2, and it simply awards you an extra card per victory. So instead of getting 2 cards, you get 3. Thats it. The rest if of the IAPs are for extra cards, which actually are over-powered and not required or recommended. Unless you simply want to add replay value, or make the game much easier.