I went to college in North Carolina where our library closed at 10pm. As a result, I had to drive to NC State because their library was open 24hrs a day. And in the wee hours of the night I would play an online game in which I had to catapult a cow onto a target. There were no levels. There was only a catapult, a cow, and a farmer that would make a comment here and there. I would spend hours on that game. That 15 min “break” that I would take would turn into a 2 hour festival of attempting to beat my own record. So with that in mind I don’t think that I would be very productive if I attempted to play angry birds.