Dance Dance Revolution Ultramix

[danieltpc]

I read this game name on a site of XBox saved games but it was the first time i've seen DDR on xbox related sites...
I once asked the XBOX official site about DDR projects and they answered me they had no projects about it nor they would...
Is there really a DDR game fox XBox? How can i get a dance mat?
(Please dont ask to look for it on stores cause i dont live in the US , but ne WWW address should be fine for me)