High score stuff doesn't support NES games, there are all kinds of games you can add on there, but I thought NES games were probably nostalgic for a lot of people so I went that route instead of random games.
It takes me probably about 5 minutes to add a single game, so it's not too big a deal to add one, but at the same time, it's long enough that I'm not going to try to add the entire 1000+ game NES archive.
I'll see if I can add a few more later today, but I have a bunch of other features I'm working on in connection with the site that might trump adding arcade games.