I agree, I want to play doubles on SM, you can use the arrow keys and the number pad (4-8-6-2), but that's sort of goofy.
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I have been playing DDR for about 6 months now. I can pass all 7s, 8s, and a lot of 9s(not all though). 10s: 2-Sakura and Paranoia Survivor
Heavy AAs: 32. Most recent: Mahou No Tobira
Way better at Stepmania, have about 300 heavy AAs, 500+ AAAs