They had three different competing DDR machines in the arcade area they set up in front of the A-Kon Komik Market. I think DDR Max was the one directly in front of me, but the beats all collided. There was another one that had sensors where you waved hands as well, but I wasn't close enough to see what game it was, and after the total sensory overload at my table, I wasn't about to venture closer.

*waves* Well, have fun with the friendsfriends. I do that, too, when my friends aren't updating fast enough to keep me entertained. :)