Tetris! But not just any version of Tetris. They chose the illegal, unauthorized Tengen version, the only NES variant with 2 player support. The winning Omeganaut, LeRoy, bested his challenger in a best out of three before claiming his prize: a tricked-out Scion. PAX loyalists may recognize LeRoy from last year's competition where he lost by a single point in Combat. How does that saying go? Try, try again ...
As promised, we'll deliver a Joystiq t-shirt to the first person who accurately guessed the challenge's secret identity. So, the prize goes to Protoster who wrote "I'll go with tetris" as comment 13. Congrats LeRoy, congrats Protoster. We're going home, as usual, empty handed (swag bag excluded, of course).
[Note: I wrote this post live from the event, but it was apparently stuck in post-limbo. We'll be running some additional content from PAX throughout the week, including videos, interviews, and giveaways.]
[Update: Clarified inclusion of Tengen's Tetris; corrected last year's final challenge. Thanks, existonfile & Covarr.]