The back button doesn't make sense in Angry Birds. If an interface element is superfluous or unpredictable in Angry Birds then it makes no sense to bog down a

The back button doesn't make sense in Angry Birds. If an interface element is superfluous or unpredictable in Angry Birds then it makes no sense to bog down a touch interface with it. Angry Birds may seem to be a silly little game, but it is not an edge case. It's an exemplar of interaction paradigms going forward.