I give it 5 stars because it is fun to play, it is easy to advance, and it doesn't force you to empty your wallet in order to do it. Really good items can be won from the special events, so it just takes a little patience to have a really large and fast energy supply. It is friendly to both kids and their parents. I will support it with a purchase, but it won't be compulsory! That, to me, says that the developers have integrity.