Ttownanne, I just looke at the arcade and here is what it say's up top : Arcade announcements:
Welcome to the Sunshine Rewards Arcade! You can play the free games as much as you want, but if you don't post in the forum at least once a day, any high scores will not save. Premium game subscriptions are $19.99 for six months but free for everyone through July 31, 2007.
So I think it's just one post a day for your high score to record.
I believe there are some problems with the games right now and I am sure SunshineGirl is working on it.
Hope that helps you a bit .

Dovie