I have to give a shout out to Angry Birds for keeping my kid (age 5) happy. Although the craze hit our family a bit late, (due to the smartphone resistance) it has hit us hard. Steel loves it. He goes from phone to phone and plays, plays, plays. We have them all, the original, Seasons and Rio. Steel likes Rio the best. I will have you know that Cedar Point also has Angry Bird stuffed animals for prizes at some of their games! (Yes, we have a couple. I don't dare tell you how much we had to pay for each of them for Steel to 'win' them.)
We only play the free versions. I still have yet to pay for any app.