With DEF CON XXI scheduled for August 1-4, 2013 in Las Vegas, NV, the conference crew has posted an online Human Badge Challenge. The challenge consists of a word search puzzle contaning contest names, along with a hidden puzzle element. Download their Contest PDF for contest and entry rules, puzzle hints and links to submit your entry. Successful answers to the contest will be entered into the drawing for a free DEF CON 21 T-shirt, and if you enter the correct answer to the second stage you are entered in the drawing to win a DEF CON 21 T-shirt and a Human Badge!” (Unfortunately, the rules require that you attend DEF CON in order to actually pickup your prize, but contests are fun even if you’re not attending this year.)