four
FOUR
FOUR?!?!?!
That is an awful lot of DDR, I hope one of them is the version that contains "It's Raining Men!"
During the peak of the DDR craze I think the big arcade in Ann Arbor here had five machines, and the arcade in Brighton had...something like seven. The place in Brighten went under, but Pete's in Ann Arbor is still around. It has Guitar Freaks 5 and Drummania 5 linked, a few other Guitar Freaks games, Para Para Paradise, Dance Maniax...probably something else Beamania related.
They no longer have Beatmania IIDX Substream, Outrun 2, or GunMania. Gunmania was the most unreliable machine I've ever seen, btw.
Brighten had two copies of Punchmania: Fist of the North Star, and also the upgraded Scud Race, which I haven't played anywhere else.