A good suggestion I think is having high-scores for all the games. This will give members more motivation to play games to the fullest and compete with others. Also add a small section to member profiles, mebe to show the games that member was able to get the high score on. I also suggest enabling guest to get high-scores on games because then it might influence them to join.
Having said that, what does everyone think about my suggestion?
(P.S from what I seen few games have high scores and is hard for people to recognize it because there only on the game, no where else.)