I enjoy the game. It's interesting and fun to play. However I'm frustrated with losing gems, earning energy, earning books and getting through chapters. One minute I have a hundred gems then in the blink of an eye I'm down 60 and I didn't purchase anything with them. It takes a long time to earn things. I need X number of them to purchase things like creatures in order to move through the levels, yet it takes a long time to earn them. I don't mind earning them but it shouldn't take so long.