I think pretendo could revive the Just Dance servers, or at least wdf
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it's not that easy cuz just dance used ubisoft servers, not nintendo ones an either not peer to peer
at least we have the jd2015 server revival by danceparty legacy
DanceParty Legacy maybe
no bc on the unofficial pretendo compatibility wiki it says they are not planning to revive the jd servers as it is owned by ubisoft
i wish