I have an Android app that uses Google's leaderboard and what I want to accomplish is for the app to show a Congratulations screen to the user who reaches a certain score. So for example, I would want the app to show a splash screen with a message to the user who first reaches let's say 2,000 points. On the same splash screen, I will also want to have a short form where the user can submit some info. After a user reaches 2,000 points, I would want the app to ignore any future users who reach 2,000 points, until I have this feature enabled again.
Hope this makes sense.