Fun at first, then it's a source of frustration. I enjoyed this game until I got about 2,000 levels in. It became impossible to beat these levels without using a booster. Starting a "super hard level" with only 12 moves is asinine. There are some levels I have played far too many times, like the last one I was on that I had to play 86 times before I got sick of it and used all my boosters. The next level I've played 31 times and decided to leave a review and uninstall. Don't waste your time.