... very tough. Thank goodness for hints.
If you play, and don't have the patience to wade through the hint blog, I'll offer a hint here in the comments.
Update: The answer is posted in the comments now, so don't go there if you don't want to see it.
By the way, the points you earn are supposed to be redeemable in some way after the site launches (which is soon), so it might be worth it to have done these puzzles, beyond the fun that is.
Go to Tanga.