In the 3 or 4 games we never used the "back" button Sometimes we had to press the "play" button several times. It was hard to decide what seems to be the reason: I think on the one hand the button is to small but on the other hand the game logic sometimes seems to need some time until the requested move was done. Sometimes we felt it a little bit to much to press play after each move but I think I we need some more impressions to decide if it is a good or not so good idea.