Love this game! I finished all the levels without ever buying anything with actual money. It was tricky sometimes and I did use plenty of their game coins but it's doable and a fun challenge. I do wish you could keep playing continuously. I was so determined to not spend real money that I often had to just stop playing for a while when I ran out of lives and couldn't get anymore (they build back up over time.) But I understand they want to make some money on their end! All in all fab game!