During the Final Fantasy XV Release Eve Official Community Broadcast, Square Enix brought a special version of the new installment dubbed the "Mystery Disc" and streamed it.
This version of the game takes place in a festival in the city of Accordo, celebrating the release of Final Fantasy XVin an entertaining, fourth-wall breaking manner. It features some fan praise in the form of fan art rendered in-game, and a puzzle with a giant version of Prompto. Lastly, the event closes with a battle between one of the protagonists Noctis and none other than CEO of Square Enix himself: Yosuke Matsuda.
The video below is Japanese but subtitled:
