Retro? I vote for Battlezone! I've seen little Java type adaptions of it somewhere, so maybe it's been adapted for this game platform (it's some kind of Macromedia Flash interface, right?)
I notice a few of the games seem to come from this site: http://www.neave.com/games/ Now how did we miss out on Tic-Tac-Toe?
Here's a site with the famous "Moon Patrol", as well as Donkey Kong and some other neat ones. Of course just being a Flash game probably isn't enough, right? Somehow the thing has to be hacked to return the scores to the board system, right?
Actually, never mind... their Donkey Kong seems a bit buggy to me. The arrow keys only work intermittently.