This game is all about trying to push you to buy coins. If you don't have coins good luck playing the game. It's near impossible to build your coins up since the bonuses are very rare. However when you do have coins the game is very fun and fun to complete missions. Good luck doing missions when your rank is high and you have no coins. That's when you'll either delete the game or buy coins. I myself will delete the game since buying coins is expensive for very little amount of coins.