Fun game! The puzzles are tricky, but not too hard. And, I like that this game can be played without having to pay anything. There are things you can purchase, and they would be worth it. I also like that, although you do run out of energy, there are things to do while you are waiting for the energy to rebuild. I ALSO like that there is a main story, along with side stories. I have gotten to the end of what is available. I look forward to more content!