Basically, comment your Green it. user name below by the 4th of September, and then on 7th, the person who has the best Quick Play highscore will receive a cheat code that will unlock a secret additional stadium. This will give you about a week or so to try to get the highest score you can manage.
Your previous highscores won't count. I have the ability to monitor score submits, so I'll know if someone pretends to be someone else, or if someone tries to win using a score they earned before entering.