I found this:Theatrhythms will be able to play online linked.
From here: https://finalfantasy.fandom.com/wiki/Theatrhythm_Final_Fantasy_All-Star_CarnivalOne of the largest additions is cooperative play. In online mode, each player is automatically matched with other players from around the world. In local-multiplayer mode, players can instead partner with others that are using neighboring All-Star Carnival cabinets within the same arcade.
So they need to be connected to the S-E network for local multiplayer? Is it a subscription based model like all the others?