Great addicting game! You can play for hours, and can recharge using food you can easily build. Not pay-to-play at all, though you certainly could. My only complaint is that the font size is quite small for a small phone. Also the speech bubbles at the end of the quest completion get covered up by the quest completion window. Also is there any way to dismiss the speech bubbles during levels other than just waiting? They do tend to cover the planning area.