You pretty much never earn enough coins. And I found that I had to use gems every single time I bought something because I never have enough coins. Everything is over priced. So far I'm glad I haven't invested any real money into this game. Some of the levels are ridiculously hard to beat and I'm tired of wasting my time with having to start levels over. I love the concept of this game but I'm having trouble enjoying it. Update: I'm uninstalling...