To search for treasure (and, duh, get prizes), you will need to register a 'player-name' and your zipcode.
  (But we very much recommend you also provide an email address, why?)
  (And why's the zipcode importnat?)
Your player-name is only used to display the leaders & winners, and help you keep track of your own points.
Only when you win a prize will you need to go to the 'contact' page, and give us more information and only then if you really want to.
Once you win, and tell us how to contact you, we will do just that, contact you and arrange to send you your prize.
We will never provide your personal information to anyone.