When I'm done playing a game. I delete the contents but keep the folder which usually has the game version. So when I see a game I don't remember, I just check the blank folders if that title is on there and if it's not then I download and repeat.
Played it on public transport when I was on my daily 2-hour commute to uni. Wasn't so bad, people generally don't care what other people are doing on their phones.