Scores!
Most of these games have high scores of some kind. It would (I think) be slightly more interesting if we could compete with one another.
All that's needed is 2 fields per user per game (if they even want to use it), one for the score, the other for some information, like 'how I did this!', or a link to a screenshot. I know it's just more data to store and display but I think it could make it a little more interesting.
Of course, there's a bit of a trust element, but this is CB!
Thoughts?
