To claim your code, simply leave a comment on this post telling us why you'd like to get into the closed beta. From there you'll get an email with the key code and instructions on how to redeem the code (so make sure your registered email is correct!). All comment entries must be in by Monday, June 29th, 2009 at 9am EST when eligibility will close. Only one prize per person. Good luck!
[Update: We've just been told that the WonderKing closed beta will begin on July 16th, not the 9th as previously announced.]