You don't just listen to the music; you play through it. You assemble a party of over 100 iconic characters (like Cloud, Terra, or Noctis) to fight monsters and bosses in rhythm-based battles.
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The game includes local co-op for two players and online "Multi Battles" for up to four, where you can compete to see who has the best timing. Why "XCI"? You don't just listen to the music; you play through it