GPSgames.org has been offline since July 21, due to a hacker attack that corrupted the server hosting the games. But this happened a month after I announced that all the games at GPSgames.org were being retired, so the harm was less than it could have been.
Anyway, I've finished moving all the games to a new server. I've disabled the ability to create new games, but you should still be able to search the archives. You also may be able to submit new finds for old things in the database that are still active, like Geodashing waypoints, Shutterspots and GeoVexilla flags.
Have a look and let me know by private email if you find any errors.