I'm going to play until my energy runs out and then uninstalling. The game is designed for you to make purchases in order to really cover any ground. I've stupidly spent too much money. There are ways to get energy, but what you receive isn't worth it and won't get you far at all. Just as an example, it costs you more energy to collect the items for the Shaman than what you get in return. I'm so glad that I didn't share this with my friends.